The appropriation of war funds and the cleansing of foreign influences from China are among the purposes of the Great Anti-Buddhist Persecution initiated by Tang Emperor Wuzong.

As such, the persecution is directed not only towards Buddhism but also towards other foreign religions, such as Zoroastrianism, Nestorian Christianity, Manichaeism.

The four-year persecution reaches its height in the year 845 CE, then dissipates.

Only the native Chinese ideologies of Confucianism and Taoism survive the upheaval relatively unaffected.

East Central Europe (844–855 CE): Consolidation of Great Moravia, Liudolfing Saxony, and Strengthening of East Francia

Between 844 and 855 CE, East Central Europe—comprising modern-day Poland, Czechia, Slovakia, Hungary, and the eastern parts of Germany and Austria east of 10°E and north of a line from approximately 48.2°N at 10°E to the Austro-Slovenian border near 46.7°N, 15.4°E—experienced notable political, cultural, and economic stabilization. The period saw the firm establishment of Great Moravia under Rastislav, rising Saxon political power through the influential Liudolfing dynasty, and growing stability within East Francia under the rule of Louis the German. These developments reinforced regional identities and laid important groundwork for future medieval kingdoms and dynastic struggles.

Political and Military Developments

Rastislav and the Consolidation of Great Moravia

• Under Prince Rastislav (r. 846–870 CE), Great Moravia grew into a prominent Slavic polity, pursuing strategic autonomy from Carolingian dominance. Rastislav strengthened internal governance, established fortified settlements, and expanded his political reach diplomatically and militarily across neighboring Slavic territories.

Rise of the Liudolfing Dynasty in Saxony

• Saxon noble power reached new prominence under Liudolf (d. 866), whose dynasty established influential territorial and ecclesiastical centers along the Leine River. Liudolf's family, now called the Liudolfings, laid crucial foundations for what would later become the Ottonian imperial dynasty.

Stabilization of East Francia Under Louis the German

• In the aftermath of the Carolingian partition at the Treaty of Verdun (843 CE), Louis the German (r. 843–876)effectively stabilized and governed East Francia. His authority over Bavaria, Thuringia, and Saxony strengthened these territories' integration within a coherent political and administrative framework.

Economic and Technological Developments

Prosperity in Regional Trade Networks

• Strong commercial links among Moravia, Saxony, Bavaria, and Thuringia supported vibrant trade in metals, textiles, agricultural products, and luxury goods. Economic stability promoted regional prosperity and facilitated sustained urban and rural development.

Infrastructure and Defensive Improvements

• Continued investments in fortifications, roads, and administrative infrastructure bolstered regional security and facilitated economic and military coordination across Moravia, Saxony, and East Francia’s eastern frontier.

Cultural and Artistic Developments

Moravian Cultural Flourishing

• Rastislav actively promoted a distinct Moravian culture, fostering the growth of unique artistic styles, ceramics, metalwork, and architecture. This cultural enrichment solidified Great Moravia’s identity and prestige within the region.

Carolingian Cultural Influence in Saxony

• Saxon territories further integrated Carolingian cultural traditions, particularly through religious foundations like Gandersheim Abbey (founded in 852 CE by Liudolf and Bishop Altfrid of Hildesheim), embedding Christianity and Frankish administrative customs firmly into Saxon society.

Settlement and Urban Development

Moravian Urban Expansion

• Major Moravian settlements continued their growth, becoming influential centers of administration, trade, and cultural production, providing essential foundations for later medieval urban centers.

Saxon and Bavarian Urban Stability

• Urban areas in Saxony, Bavaria, and Thuringia maintained steady growth, benefiting from stable governance, improved infrastructure, and active commercial trade networks, reinforcing their regional importance within East Francia.

Social and Religious Developments

Deepening of Christianization

• The sustained efforts of Carolingian missionaries and local leaders expanded Christianity significantly throughout Saxon and Moravian territories, reinforcing religious institutions and integrating East Central Europe deeper into the Christian cultural sphere.

Consolidation of Dynastic Power

• Prominent dynasties, notably the Liudolfings in Saxony and Mojmirid rulers in Moravia, further solidified social hierarchies and leadership structures, shaping regional political and social organization significantly for future generations.

Long-Term Consequences and Historical Significance

The period 844–855 CE marked critical developments in East Central Europe’s historical trajectory. Rastislav's political and cultural consolidation in Great Moravia, the rise of influential Saxon noble families like the Liudolfings, and Louis the German’s stabilization of East Francia collectively reshaped regional identities and governance structures. These transformations established lasting foundations for subsequent medieval kingdoms, significantly influencing East Central Europe's political, social, and cultural landscape for centuries.

Prince Popiel of Gnesen, dying in the second half of the ninth century, was succeeded by Siemowit, the son of the prince's plowman, Piast, according to a twelfth-century Polish legend, thus founding a dynasty that will rule the Polish lands until 1370. (The name Piast will not be applied to the dynasty until the seventeenth century.)

Another legend relates that, when various tribes in what is now Poland decide to unite, they ask a Jew, Abraham Prochownik, to be their king.

He declines in favor of a peasant named Piast, the founder of the Piast dynasty.

Advances in the area of classical studies under the Byzantine cultural revival include the gradual substitution of the minuscule, or smaller, cursive hand for the uncial, or larger, script, and the increase in the number of scriptoria, or copyists' workshops.

Eastern Southeast Europe (844–855 CE): Cultural Revival and Scholarly Advances

Settlement and Migration Patterns

Continued Stability and Cultural Integration

From 844 to 855 CE, Eastern Southeast Europe maintained demographic stability, with settlements continuing to consolidate. Cultural integration among diverse communities persisted, reflecting regional resilience amid broader political developments.

Political and Military Developments

Continued Regional Stability

The Byzantine Empire maintained a period of relative military stability, sustaining the gains achieved through earlier campaigns against Arab and Slavic threats. This stability enabled increased focus on internal developments and cultural projects.

Economic and Technological Developments

Sustained Economic Prosperity

Economic conditions remained stable, with fortified trade routes and infrastructure continuing to support regional commerce and productivity. This ongoing economic resilience facilitated further cultural and scholarly endeavors.

Ongoing Defensive Enhancements

Military fortifications continued to be maintained and improved, ensuring regional security and the protection of economic and cultural interests throughout the Byzantine-controlled territories.

Cultural and Artistic Developments

Byzantine Cultural Revival

The period was marked by notable advances in classical studies under the Byzantine cultural revival. Significant developments included the gradual substitution of the minuscule, or smaller cursive handwriting, for the traditional uncial script, as well as an increase in the number of scriptoria—copyists' workshops—which supported scholarly and literary production.

Flourishing of Intellectual and Artistic Life

Artistic and scholarly activities flourished, driven by the enhanced capabilities of these scriptoria. This growth significantly contributed to the preservation and dissemination of classical and theological knowledge, reinforcing cultural continuity and resilience.

Social and Religious Developments

Ongoing Influence of Icon Restoration

The restoration of icon veneration continued to profoundly influence social and religious practices. This period further solidified the role of Eastern Orthodox institutions, contributing to regional cohesion and cultural identity.

Strengthened Community Cohesion

The cultural revival, including scholarly and literary advancements, supported greater community cohesion. Religious institutions remained central to societal stability, reinforcing regional identity and spiritual unity.

Long-Term Consequences and Historical Significance

The period from 844 to 855 CE saw significant cultural and scholarly advancements, exemplified by developments in manuscript production and classical studies. These scholarly contributions enriched Byzantine cultural heritage and reinforced the region’s intellectual resilience, leaving enduring impacts on Eastern Southeast Europe’s historical trajectory.

The Middle East: 844–855 CE

Abbasid Instability and the Rise of Regional Autonomy

This era witnesses growing instability within the Abbasid Caliphate as the caliphs struggle to assert effective control over their vast empire. The relocation of the capital to Samarra, initially intended to ease tensions between Arab populations and the increasingly dominant Turkish guards, ultimately exacerbates factionalism and military interference in political affairs.

Under Caliph al-Wathiq (842–847), the influence of Turkic generals continues to intensify, with these powerful mercenary commanders exerting considerable pressure on the caliphate. Their growing influence sets the stage for increased internal division, undermining central authority.

The reign of Caliph al-Mutawakkil (847–861) marks a decisive turn as he attempts to curb Turkish dominance and restore traditional Islamic values by ending the mihna, the inquisition regarding the created nature of the Qur'an, which had deeply divided the Islamic community. Al-Mutawakkil champions Sunni orthodoxy, promoting the Hanbali school of jurisprudence and marginalizing the rationalist Mu'tazilites favored by previous caliphs.

While al-Mutawakkil’s reign brings a revival of conservative Sunni orthodoxy, his efforts to reduce Turkish influence provoke violent backlash from military factions. His reign thus symbolizes both a return to traditionalism and the continued fragmentation of Abbasid political authority.

During this period, provinces on the periphery of the empire increasingly assert their autonomy, setting the stage for regional dynasties and political fragmentation. Although the Abbasid court remains culturally vibrant, especially in Samarra, the seeds of decentralization sown in these years will significantly alter the political landscape of the Islamic Middle East in the ensuing decades.

The successors of Abbasid caliph Al-Mutasim’ follow his policy of maintaining a special military corps composed of imported enslaved Turkish men and mercenaries.

This practice will soon result in the relegation of the caliphs to mere puppets of their Turkish troops, whose commanders will begin to claim portions of the empire as their virtually independent domains.

'Abbasid rulers encourage the settlement and fortification of coastal Palestine to secure it against Constantinople’s forces.

Mediterranean Southwest Europe (844–855 CE): Intellectual Flourishing in Rome and Jewish Cultural Center in Lucena

The era 844–855 CE in Mediterranean Southwest Europe sees significant intellectual developments in Rome, facilitated by cultural ties to the East, alongside the consolidation of Jewish cultural life in Al-Andalus.

Intellectual Revival in Ninth-Century Rome

During this era, Rome experiences a notable intellectual revival, greatly influenced by its cultural connections with the Greek-speaking East and the Frankish courts. Figures such as Anastasius the Librarian (d. c. 878 CE) emerge as prominent international scholars, bridging Eastern and Western intellectual traditions. Anastasius, known for his erudition and diplomatic connections, symbolizes Rome’s renewed significance as a vibrant intellectual hub during the ninth century.

Lucena: Center of Andalusian Jewry

In Al-Andalus, the city of Lucena, reputedly founded by Jews centuries earlier, reaches prominence as the foremost cultural center of Andalusian Jewry by the mid-ninth century. Known for its scholarly and religious achievements, Lucena emerges as a unique all-Jewish city under Muslim rule, fostering a rich intellectual tradition and significantly influencing Jewish life throughout the Islamic world.

Continued Cultural Interaction and Religious Pluralism

Throughout Iberia, the coexistence and interaction among Jews, Mozarabs, and Muslims remain vibrant, facilitating cultural exchange and intellectual growth. Lucena’s prominence highlights the integral role of Jewish communities in maintaining scholarship, commerce, and intercultural dialogue within the broader context of Islamic Iberia.

Carolingian Stability and Papal Influence

In Italy, Carolingian governance under Lothair I maintains relative stability following the Treaty of Verdun (843 CE), though political fragmentation increasingly characterizes the broader Carolingian Empire. The papacy retains significant authority, continuing its diplomatic role and reinforcing Rome's intellectual vitality through active engagement with Eastern traditions and Frankish influences.

Economic Prosperity and Technological Continuity

Economic activity across Mediterranean Southwest Europe benefits from ongoing technological developments such as the widespread use of the Catalan forge. Continued enhancements in iron production support agricultural productivity, military strength, and urban craftsmanship, underpinning regional stability and prosperity.

Legacy of the Era

The era 844–855 CE is marked by significant cultural and intellectual developments, particularly the intellectual revival in Rome and Lucena's prominence as a center of Jewish culture. These developments underscore the vibrant multicultural interactions defining the region’s historical trajectory during the ninth century.

Rome maintains a level of intellectual life owing largely to its links with the Greek culture of the East; it experiences a flowering of new writing in the ninth century around international figures such as Anastasius the Librarian (d. around 878), who has contacts with both Constantinople and the courts of the Frankish kings.