The development of the Russian state can be traced from Vladimir-Suzdal' through Muscovy to the Russian Empire.

Muscovy draws people and wealth to the northeastern periphery of Kievan Rus'; establishes trade links to the Baltic Sea, the White Sea, and the Caspian Sea and to Siberia; and creates a highly centralized and autocratic political system.

Muscovite political traditions, therefore, exert a powerful influence on Russian society.

East Europe (1252 – 1395 CE): Mongol Suzerainty, Novgorod’s Fur Republic, and Lithuania’s Expansion

Geographic and Environmental Context

East Europe includes Belarus, Ukraine, and the European portion of Russia (including the sixteen Russian republics west of the Urals).

• Anchors: the forest and forest-steppe zones of the Dnieper, Volga–Oka, and Upper Dvina basins; the steppe corridor north of the Black Sea; and the Novgorod–Pskov lakelands tied to the Baltic.

• Strategic axes: Dnieper–Desna, Volga–Oka, Western Dvina, and Don; Baltic connectors through Novgorod and Pskov.

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Climate and Environmental Shifts

• Late Medieval Warm Period yielded to the early Little Ice Age after c. 1300: longer winters, more frequent spring floods, and shorter growing seasons on the northern fringe.

• River freezes lengthened the winter over-ice transport season, facilitating fur and grain movement to urban markets.

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Societies and Political Developments

• Mongol conquest and the Golden Horde (Jochid ulus):

  • The Mongol campaigns (1237–1240) dismantled the Kievan Rus’ commonwealth. Principalities survived under Horde suzerainty—paying tribute (yasak), hosting basqaq agents, and using the Horde courier system (yam).

  • The Horde’s capitals at Sarai (lower Volga) coordinated levies and trade; steppe raids remained a constant frontier pressure.

• Vladimir–Suzdal’, Tver’, and Moscow:

  • On the Volga–Oka, rival knyaz lines competed for the Horde’s patent (yarlik) to the grand princely title of Vladimir.

  • Moscow rose from a junior appanage: Ivan I “Kalita” (1325–1341) secured the tribute-collector role, attracting boyars and clergy; Dmitry Donskoy defeated Mamai’s army at Kulikovo Field (1380), a landmark of resistance, though Toqtamish burned Moscow (1382).

• Novgorod and Pskov (veche republics):

  • The Novgorod Republic remained autonomous under Horde suzerainty by avoiding direct confrontation, governed by a popular assembly (veche) and posadniks.

  • It dominated the fur–wax–honey trades and dealt with the Hanseatic League via the kontor in Toruń/Visby; Pskov emerged as a semi-independent sister republic.

• Galicia–Volhynia and the rise of Lithuania:

  • King Danylo (Daniel) of Galicia (crowned 1253) revived the southwestern Rus’ realm, but by the 14th c. the Grand Duchy of Lithuania absorbed most Rus’ lands.

  • Under Gediminas (1316–1341) and Algirdas (victory at Blue Waters, 1362), Lithuania took Kiev and the Dnieper marches; after the Union of Krewo (1385) and Christianization of Lithuania (1387), a Polish-Lithuanian dynastic bloc formed, ruling much of Belarus and Ukraine.

• Steppe frontier:

  • Rus’ principalities, Lithuanian border castles, and later Moldavian and Wallachian states contested the Black Sea approaches amid shifting Horde factions.

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Economy and Trade

• Agrarian base: rye, oats, and barley dominated the forest zone; wheat and millet in the forest-steppe. Three-field rotation spread on the more southerly soils.

• Fur economy: sable, marten, squirrel, and fox from taiga and mixed forests remained the premier export through Novgorod–Hanse channels and via Volga routes to Sarai.

• Long-distance routes:

  • Volga corridor: grain, salt, fish, and crafted goods moved to the Horde markets and the Caspian.

  • Baltic corridor: Novgorod and Pskov exported furs, wax, and flax; imported silver, cloth, and salt through Hanseatic towns.

  • Dnieper–Black Sea traffic declined after the Mongol shock but partially revived under Lithuanian protection in the later 14th c.

• Urban crafts & coinage: smithing, tanning, and milling flourished in river towns; silver grivna bars and later fractional pennies circulated alongside foreign denars and Prague groschen.

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Subsistence and Technology

• Agriculture & stock: ard and heavy plough on loams; horse and ox traction; beekeeping (forest apiculture) supplied wax and honey.

• Fortifications: timber-earth ramparts and later stone kremlins (e.g., Moscow’s white-stone walls from 1367) secured capitals and river nodes.

• Transport: river barges in ice-free seasons; winter sled-trains along frozen rivers and packed snow routes; Horde yam way-stations accelerated couriers and tribute convoys.

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Movement and Interaction Corridors

• Volga–Oka–Klyazma triangle: heartland of northeast Rus’ power (Vladimir, Moscow, Tver’).

• Upper Dnieper–Pripet–Western Dvina: Lithuanian–Rus’ arteries binding Kiev, Smolensk, Polotsk, and Vilnius.

• Novgorod–Ladoga–Neva: gateway to the Baltic and Hanse.

• Steppe roads from Sarai to the Don/Lower Dnieper: conduits for tribute, trade, and raids.

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Belief and Symbolism

• Orthodox Christianity: the Metropolitan’s seat shifted from Kiev to Vladimir (1299) and effectively to Moscow (1325); monastic renewal under Sergius of Radonezh (d. 1392) anchored spiritual and agrarian colonization of the northeast.

• Latin Christianity: strong in Galicia–Volhynia and later within Lithuanian–Polish spheres; cathedral foundations and mendicant houses appeared in frontier towns.

• Mission & frontier faiths: St Stephen of Perm (d. 1396) evangelized among the Komi; in steppe zones, Islam advanced within the Horde elite while popular Tengrism persisted.

• Cult and memory: chronicles, saints’ lives, and battle legends (e.g., Kulikovo) forged shared identities across fragmented polities.

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Adaptation and Resilience

• Political layering: veche republics, appanage principalities, Horde suzerainty, and Lithuanian grand-ducal rule coexisted—allowing trade and church life to continue despite warfare.

• Route redundancy: when Dnieper routes faltered, Volga and Baltic corridors carried exchange; winter travel compensated for summer insecurity.

• Monastic colonization: cleared forests, drained bogs, and created agricultural oases that stabilized settlement and provided safe havens.

• Fiscal pragmatism: tribute arrangements with the Horde and yarlik politics bought breathing room for rising centers (notably Moscow).

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Long-Term Significance

By 1395, East Europe had reconfigured its political geography:

• The Golden Horde still dominated the steppe; yet its internal strife and Timur’s blows (1380s–1395) weakened control.

• Lithuania ruled most southwestern Rus’ lands, while Moscow emerged as the chief collector and defender in the northeast.

• Novgorod remained a Baltic fur-empire under veche rule.

• The Orthodox Church and monastic networks provided cohesion—laying the spiritual and institutional groundwork for Muscovy’s 15th-century ascent and for a durable Lithuanian-Rus’ commonwealth across the Dnieper and Dvina.

King Casimir III of Poland initiates campaigns to take Galicia-Volhynia upon the death of Bolesław Jerzy II of Mazovia in the mid-fourteenth century; these occur from 1340 to 1366.

The heartland of Rus', including Kiev, meanwhile becomes the territory of the Grand Duchy of Lithuania, ruled by Gediminas and his successors, after the semi-legendary Battle on the Irpein River.

Following the 1386 Union of Krewo, a dynastic union between Poland and Lithuania, much of what will become northern Ukraine is ruled by the increasingly Slavicised local Lithuanian nobles as part of the Grand Duchy of Lithuania.

The so-called Galicia–Volhynia Wars end by 1392.

Polish colonizers of depopulated lands in northern and central Ukraine soon found or re-found many towns.

Moscow had been an insignificant trading outpost in the principality of Vladimir-Suzdal' when the Mongols invaded the lands of Kievan Rus'.

The outpost's remote, forested location offers some security from Mongol attack and occupation, and a number of rivers provide access to the Baltic and Black seas and to the Caucasus region.

More important to Moscow's development in what will become the state of Muscovy, however, is its rule by a series of princes who are ambitious, determined, and lucky.

The first ruler of the principality of Muscovy, Daniil Aleksandrovich (d. 1303), secured the principality for his branch of the Rurik Dynasty.

His son, Ivan I (r. 1325-40), known as Ivan Kalita ("Money Bags"), obtains the title "Grand Prince of Vladimir" from his Mongol overlords.

He cooperates closely with the Mongols and collects tribute from other Russian principalities on their behalf.

This relationship enables Ivan to gain regional ascendancy, particularly over Muscovy's chief rival, the northern city of Tver'.

In 1327 the Orthodox metropolitan transfers his residency from Vladimir to Moscow, further enhancing the prestige of the new principality.

The principality of Galicia-Volhynia to the southwest has highly developed trade relations with its Polish, Hungarian, and Lithuanian neighbors and emerges as another successor to Kievan Rus'.

In the early thirteenth century, Prince Roman Mstislavich had united the two previously separate principalities, conquered Kiev, and assumed the title of grand duke of Kievan Rus'.

His son, Prince Daniil (Danylo; r. 1238-64), is the first ruler of Kievan Rus' to accept a crown from the Roman papacy, apparently doing so without breaking with Orthodoxy.

Early in the fourteenth century, the patriarch of the Orthodox Church in Constantinople grants the rulers of Galicia-Volhynia a metropolitan to compensate for the move of the Kievan metropolitan to Vladimir.

However, a long and unsuccessful struggle against the Mongols combine with internal opposition to the prince and foreign intervention to weaken Galicia-Volhynia.

With the end of the Mstislavich Dynasty in the mid-fourteenth century, Galicia-Volhynia cease to exist; Lithuania takes Volhynia, and Poland annexes Galicia.

Kievan Rus', as it was undergoing fragmentation, had faced its greatest threat from invading Mongols.

In 1223 an army from Kievan Rus', together with a force of Turkic Polovtsians, had faced a Mongol raiding party at the Kalka River.

The Kievan alliance was defeated soundly.

Then, in 1237-38, a much larger Mongol force had overrun much of Kievan Rus'.

In 1240 the Mongols had sacked the city of Kiev, then moved west into Poland and Hungary.

Of the principalities of Kievan Rus', only the Republic of Novgorod had escaped occupation, but it pays tribute to the Mongols.

One branch of the Mongol force had withdrawn to Saray on the lower Volga River, establishing the Golden Horde.

From Saray the Golden Horde Mongols rules Kievan Rus' indirectly through their princes and tax collectors.

The impact of the Mongol invasion on the territories of Kievan Rus' is uneven.

Centers such as Kiev never recover from the devastation of the initial attack.

The Republic of Novgorod continues to prosper, however, and a new entity, the city of Moscow, begins o flourish under the Mongols.

Although a Russian army defeats the Golden Horde at Kulikovo in 1380, Mongol domination of the Russian-inhabited territories, along with demands of tribute from Russian princes, will continue until about 1480.

Historians have debated the long-term influence of Mongol rule on Russian society.

The Mongols have been blamed for the destruction of Kievan Rus', the breakup of the "Russian" nationality into three components, and the introduction of the concept of "oriental despotism" into Russia, but most historians agree that Kievan Rus' was not a homogeneous political, cultural, or ethnic entity and that the Mongols merely accelerated a fragmentation that had begun before the invasion.

Historians also credit the Mongol regime with an important role in the development of Muscovy as a state.

Under Mongol occupation, for example, Muscovy develops its postal road network, census, fiscal system, and military organization.

Kievan Rus' also leaves a powerful legacy.

The leader of the Rurik Dynasty has united a large territory inhabited by East Slavs into an important, albeit unstable, state.

After Vladimir accepts Eastern Orthodoxy, Kievan Rus' comes together under a church structure and develops a Byzantine-Slavic synthesis in culture, statecraft, and the arts.

On the northeastern periphery of Kievan Rus', those traditions are adapted to form the Russian autocratic state.

Central Europe (1252–1395 CE): Dynastic Crowns, Mining Economies, and Alpine Confederations

Between the Vistula and the Rhine, from the Carpathian passes to the Alpine lakes, Central Europe in the Lower Late Medieval Age entered a period of consolidation, reform, and urban ascent. The age’s empires and kingdoms—the Luxembourgs of Bohemia, the Angevins and early Jagiellons in Hungary and Poland, and the emergent Habsburgs on the Danube—combined dynastic ambition with pragmatic governance. Mining booms, expanding universities, and the spread of urban leagues drew this vast inland heart of the continent into closer alignment with the Mediterranean and Baltic worlds.

In the east and north, the Kingdom of Bohemia, under the Přemyslid and later Luxembourg dynasties, became an imperial powerhouse. Ottokar II (r. 1253–1278) extended Bohemian rule across Austria and Styria before falling at Marchfeld to Rudolf of Habsburg. A generation later, the Luxembourgs transformed Prague into the political and cultural capital of the Holy Roman Empire. Charles IV (r. 1346–1378), King of Bohemia and Holy Roman Emperor, issued the Golden Bull of 1356, defined the imperial electors, founded Charles University (1348), and raised Prague’s Gothic skyline with the Charles Bridge and St. Vitus Cathedral. Prosperity flowed from Kutná Hora’s silver mines, whose revenues funded coinage, civic works, and imperial patronage.

To the east, Poland, long fragmented among regional dukes, was reunited under Władysław I Łokietek in 1320 and reached maturity under Casimir III “the Great” (r. 1333–1370). His reforms of law and administration, his founding of Kraków University (1364), and his incorporation of Red Ruthenia restored the kingdom’s authority. Following Casimir’s death, the Polish crown passed in personal union to Louis I of Hungary, and after his reign the Union of Krewo (1385) joined Poland and Lithuania under Jogaila (as Władysław II Jagiełło) and Queen Jadwiga, forging the Polish–Lithuanian Commonwealth’s earliest foundations.

Hungary, meanwhile, rose again under the Angevin line. Charles I (1308–1342) and Louis I “the Great” (1342–1382) reasserted royal power after the decline of the Árpáds, exploiting rich mineral wealth in Kremnica, Rudabánya, and Upper Hungary (modern Slovakia). Gold florins struck at the Kremnica mint circulated across Europe. Mining towns under German law flourished in the Carpathian uplands, and new roads over the Transylvanian passes carried salt, livestock, and silver north toward Kraków. After 1387, Sigismund of Luxembourg ascended Hungary’s throne, binding it dynastically to Bohemia and the Empire.

Along the Danube, the Habsburgs consolidated their Austrian heartland after 1278, making Vienna both a market city and an intellectual center—its university founded in 1365. Across Germany’s eastern marches, the Golden Bull enshrined the electors of Mainz, Trier, Cologne, Bohemia, Brandenburg, Saxony, and the Palatinate, stabilizing imperial governance. Brandenburg, passing from Ascanian to Wittelsbach and then to Luxembourg control, began its slow ascent under the margraves of the late fourteenth century. Urban prosperity followed river networks: the Elbe, Oder, and Vistula bound inland markets to the Hanseatic League ports on the Baltic.

Farther south, East Central Europe blended into the Alpine and Danubian core. The Swiss Confederation, born of rural leagues at Uri, Schwyz, and Unterwalden (1291), defended its autonomy against Habsburg encroachment at Morgarten (1315). Over the next century, alliances of towns and valleys—Lucerne, Zürich, Bern, and Glarus—coalesced into the early Eidgenossenschaft. To the east, leagues in Graubünden such as the Grey League (late 14th c.) coordinated defense and toll control across the Alpine passes.

The southern corridors—Gotthard, Splügen, St. Bernard, and Brenner—carried Lombard cloth and spices north and sent Alpine wool, hides, and cheese south. Merchant guilds operated fortified warehouses and toll stations, and fairs in Zurich, Chur, and along the Rhine–Bodensee system linked the Alpine world to Frankfurt and the Hanseatic ports. Despite recurrent feuds, city militias and confederate alliances kept trade open, transforming the once-peripheral uplands into Europe’s vital north–south hinge.

In West Central Europe, the Rhine–Main heartland thrived on commerce and ecclesiastical wealth. The Golden Bull of 1356 confirmed Mainz, Trier, and Cologne as prince-electors, cementing the political geography of the Empire. Frankfurt, midway between the Alps and the North Sea, hosted the imperial fairs where Italian bankers met Flemish clothiers and Hanseatic merchants. The Rhine wine trade prospered even under cooler Little Ice Age conditions; vintners adapted vineyards along the Moselle and Rheingau to changing climates.

Cathedral cities—Cologne, Worms, Speyer, Mainz, and Basel—dominated both devotion and diplomacy. Their Gothic towers embodied civic pride as well as spiritual renewal. The Black Death (1348–1352) devastated towns, sparking flagellant processions and persecution of Jewish communities in the Rhine cities, but urban guilds soon recovered, consolidating political voice. Basel, rebuilt after its 1356 earthquake, became a bridge between the Empire and the Swiss Confederation, both commercially and intellectually.

Technological and institutional innovations strengthened recovery throughout Central Europe. The spread of the three-field system, heavy ploughs, and watermills improved yields; water-powered pumps and adit drainage revolutionized mining. Civic law—Magdeburg and Lübeck codes—standardized administration from Kraków to Vienna. Universities in Prague, Kraków, and Vienna formed a northern constellation of learning where scholasticism, Roman law, and natural philosophy converged.

The region’s resilience rested on its networks. When plague or war closed overland routes, merchants shifted to the Vistula and Danube, or joined Hanseatic convoys at the Baltic. Dynastic marriages and elective compromises balanced fragmentation with unity: Luxembourgs linked Bohemia, Hungary, and the Empire; Habsburgs and Angevins wove Austria and Hungary together; and the Jagiellonian alliance bridged Poland and Lithuania. Through mining wealth, market towns, and learning, Central Europe forged institutions strong enough to withstand crisis and to shape the continent’s next age.

By 1395 CE, Central Europe had matured into a dense fabric of crowns and communes. Prague glittered as the imperial capital of the Luxembourgs; Kraków anchored a Polish–Lithuanian union; Buda and Vienna stood astride the Danube as twin centers of royal power; and the Swiss Confederates guarded their Alpine freedoms against princely overlords. The Rhine and Danube, the Vistula and Elbe, carried not only goods but the ideas and alliances that would soon ignite the Hussite reforms, Jagiellonian ascendancy, and Habsburg expansion—making Central Europe the decisive heart of the continent’s late medieval transformation.

East Central Europe (1252 – 1395 CE): Přemyslid–Luxembourg Bohemia, Angevin Hungary, and the Polish–Lithuanian Union

Geographic and Environmental Context

East Central Europe includes Poland, Czechia (Bohemia and Moravia), Slovakia, Hungary, northeastern Austria, and the greater part of Germany (including Berlin, Munich, Hamburg).

• Strategic river axes: Vistula–Oder–Elbe, Danube–Morava, and Upper Dnieper–Vistula corridors.

• Resource belts: silver (Kutná Hora), salt (Wieliczka–Bochnia), gold (Kremnica), dense forests and fertile loess soils.

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Climate and Environmental Shifts

• Late Medieval Warm Period tails into the early Little Ice Age after c. 1300: slightly cooler, more variable precipitation.

• Harvest volatility increased in marginal zones, but river-valley and loess basins sustained surpluses; plague years (1348–1352) punctuated demographic growth.

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Societies and Political Developments

• Bohemia & Moravia (Přemyslid → Luxembourg):

  • Ottokar II (r. 1253–1278) expanded into Austria–Styria before defeat at Marchfeld (1278).

  • From 1310, the Luxembourgs (John, then Charles IV, r. 1346–1378) made Prague an imperial capital: Golden Bull (1356), Charles University (1348), reforms, and urban patronage; Wenceslaus IV (1378–1419) faced magnate unrest.

• Hungary & Slovakia (Árpád → Angevin → Luxembourg):

  • After the Árpád extinction (1301), Charles I (Angevin) (1308–1342) restored royal power; Louis I “the Great” (1342–1382) expanded influence (including personal union with Poland 1370–1382).

  • Mining–monetary reforms (gold florins, Kremnica mint); after 1387 Sigismund of Luxembourg took the crown. Slovakia (Upper Hungary) was the mining and urban core.

• Poland (fragmentation → reunification → union):

  • Władysław I Łokietek crowned (1320) reunified the kingdom; Casimir III “the Great” (1333–1370) reformed law, founded Kraków University (1364), and took Red Ruthenia (1340s); after 1370, union with Hungary under Louis I.

  • Union of Krewo (1385): Jogaila marries Jadwiga, becomes Władysław II Jagiełło (1386), inaugurating the Polish–Lithuanian polity.

• Northeastern Austria (Habsburgs):

  • After 1278 the Habsburgs consolidated Austria–Styria; Vienna grew as a Danube market and (from 1365) university town.

• Germany (eastern zones: Brandenburg, Saxony, Bavaria):

  • Electoral order fixed by Golden Bull (1356) (King of Bohemia, Margrave of Brandenburg, Duke of Saxony among electors).

  • Brandenburg passed from Ascanian to Wittelsbach to Luxembourg control (1373); Munich anchored Upper Bavaria; Berlin–Cölln rose on Spree–Havel trade.

• Order states on the Baltic rim (context to Poland/Lithuania):

  • The Teutonic Order state in Prussia and Livonia pressed the Vistula–Neman frontier, shaping Polish–Lithuanian strategy (the great reckoning at Grunwald lies just beyond 1395).

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Economy and Trade

• Mining & mints:

  • Kutná Hora silver funded Luxembourg grandeur (Prague groschen).

  • Kremnica gold struck florins for Hungary; salt from Wieliczka–Bochnia underpinned Polish revenue.

• Agriculture & towns: three-field rotations spread; German-law towns (Ostsiedlung legacy) structured markets from Silesia to Little Poland and Upper Hungary.

• Trade corridors:

  • Danube–Morava–Vienna funneled Adriatic and Alpine goods into the plain.

  • Vistula–Baltic carried Polish grain, timber, and salt to Gdańsk, linking into Hanseatic circuits.

  • Elbe–Oder routes tied Bohemia/Silesia to Saxon–Brandenburg markets.

• Hanseatic connections: eastern German and Polish ports traded cloth, beer, wax, and furs; inland towns brokered metals and salt.

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Subsistence and Technology

• Hydraulic & agrarian tools: heavy ploughs on loess, watermills on rivers, drainage and vineyard terraces in Bohemia and along the Danube.

• Urban craft clusters: Prague metalwork and glass; Kraków cloth and salt; Upper Hungary mining technologies (adits, water-powered pumps).

• Fortifications & courts: stone kremlins, castles, and walled towns; law codes (Magdeburg/Lübeck law, Casimir’s statutes) standardized justice and commerce.

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Movement and Interaction Corridors

• Danube trunk: Vienna ⇄ Bratislava (Pressburg) ⇄ Esztergom/Buda integrated Habsburg and Hungarian nodes.

• Vistula spine: Kraków ⇄ Toruń/Gdańsk linked the Polish heartland to the Baltic.

• Elbe–Oder passes: Bohemia ⇄ Saxony/Brandenburg; Moravian Gate tied the Danube to the Vistula–Oder basins.

• Carpathian routes: salt, wine, and livestock over Transcarpathian passes into Poland and Hungary.

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Belief and Symbolism

• Latin Christianity: cathedral and monastic expansion (Prague, Kraków, Vienna); mendicant orders in towns; scholastic culture around the new universities.

• Orthodoxy & Unions: Ruthenian borderlands under Lithuania remained Orthodox; Latin-rite Poland extended bishoprics into Red Ruthenia.

• Popular piety: pilgrimage, confraternities, and plague-era devotions; Jewish communities vital to urban finance faced periodic persecution during the Black Death years.

• Crown ideology: imperial Prague under Charles IV; Angevin regalia and chivalric display in Hungary; Jagiellonian union rhetoric in Poland–Lithuania.

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Adaptation and Resilience

• Institutional depth: estates and diets (Bohemian land diets, Polish sejmik beginnings, Hungarian diets) mediated taxation and war.

• Demographic shocks: Black Death mortality (from 1348) hit towns hardest; frontier colonization and mining towns helped recovery.

• Route redundancy: Danube, Vistula, and Baltic carried trade when war blocked overland links; Hanseatic convoys stabilized supply.

• Dynastic flexibility: Luxembourg, Habsburg, Angevin, and Jagiellonian strategies (marriage, enfeoffment, union) minimized fragmentation costs.

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Long-Term Significance

By 1395, East Central Europe had become a constellation of powerful crowns and rising unions:

• Prague led an imperial–university renaissance;

• Hungary monetized mining and projected power into the Balkans;

• Poland–Lithuania formed a durable union that would reshape the northeast;

• Habsburg Austria entrenched along the Danube.
  Shared corridors of metals, salt, grain, and ideas forged an integrated region poised for 15th-century conflicts and cultural efflorescence—from Hussite revolutions to Jagiellonian and Habsburg ascendancy.

The union of Poland with Lithuania, under a dynasty founded by the Lithuanian grand duke Jagiello, dominates is the next major period in Poland's history.

The partnership proves profitable for the Poles, who will play a dominant role in one of the most powerful empires in Europe for the next three centuries.

Poland's unlikely partnership with the adjoining Grand Duchy of Lithuania, Europe's last heathen state, provides an immediate remedy to the political and military dilemma caused by the end of the Piast Dynasty.

At the end of the fourteenth century, Lithuania is a warlike political unit with dominion over enormous stretches of present-day Belarus and Ukraine.

Putting aside their previous hostility, Poland and Lithuania see that they share common enemies, most notably the Teutonic Knights; this situation is the direct incentive for the Union of Krewo in 1385.

The compact hinges on the marriage of the Polish queen Jadwiga to Jagiello, who becomes king of Poland under the name Wladyslaw Jagiello.

In return, the new monarch accepts baptism in the name of his people, agrees to confederate Lithuania with Poland, and takes the name Wladyslaw II.

In 1387 the bishopric of Wilno is established to convert Wladyslaw's subjects to Roman Catholicism.
(Eastern Orthodoxy predominates in some parts of Lithuania.)

From a military standpoint, Poland receives protection from the Mongols and Tatars, while Lithuania receives aid in its long struggle against the Teutonic Knights.