The causes of the Muscovite Civil War …
Years: 1445 - 1445
The causes of the Muscovite Civil War waged in the second quarter of the fifteenth century are still disputed.
However, Dmitri Donskoi's will ran contrary to Rurikid dynastic custom, whereby the throne would pass from an elder brother to a younger one (lateral inheritance), rather than from father to son (linear succession).
The testament had provided for the accession of his son, Vasily I, which was still in keeping with the tradition of lateral succession, since Vasily was the eldest of his generation.
In the event of Vasily having no surviving son at his death, his brother, Dmitry's second son, Yury of Zvenigorod, was to succeed as grand prince in Moscow.
Upon Vasily I's death, however, Yury had refused to come to Moscow and swear allegiance to his nephew, Vasily II, and claimed the throne himself in accordance with his right under the long-held custom of lateral inheritance.
(He further claimed it was provided for in Dmitry's testament—but this ignored the provision that voided Yury's succession in the event of Vasily I producing a son).
Yury's son, Dmitry Shemyaka, had actively participated in all of his father's incursions against Moscow, culminating in Yury's capture of Moscow and accession as grand prince in 1433.
Yury of Zvenigorod had died in Moscow in 1434.
After Yury's death, Shemyaka continued to press his branch's claim to the grand princely throne, and was seldom at peace with Vasily II.
Initially, Dmitry and his younger brother Dmitry Krasnyi had concluded an alliance with Vasily against their elder brother Vasily Kosoy, who had proclaimed himself grand prince.
They had succeeded in driving Kosoy from Moscow and were rewarded with the towns of Uglich and Rzhev.
The following year, Shemyaka had come to Moscow in order to invite Vasily II to his impending wedding with a princess of Yaroslavl, but was accused of siding with Kosoy and taken prisoner.
Released several months later, he was sent by Vasily II to defend Belyov against a small army of the Kazan Khan Olugh Mokhammad but had been defeated.
Thereupon he refused to support Vasily in his hostilities against the khan, and only the mediation of a hegumen from the Trinity Lavra of St. Sergius monastery forestalled a new civil war between the cousins.
The two men had maintained an uneasy peace for much of the next decade until 1445, when Vasily II is taken prisoner by Olugh Mokhammad after the Muscovite forces are surprised by the Tatar prince outside Suzdal.
The Tatar khan also expropriates boyar estates.
Shemyaka seizes Moscow, has the recently released Vasily blinded and proclaims himself the Grand Prince of Vladimir.
He can claim this by right of lateral inheritance since, his father had sat on the throne.
(A prince is excluded from the succession (izgoi) if his father had not sat on the throne before him.)
