Ivan Vladimirovich was first mentioned in written sources as a witness to the 1422
Treaty of Melno. After the death of Grand Duke
Vytautas in 1430, Ivan was involved in the
ensuing power struggle. Initially he supported
Švitrigaila and witnessed the anti-Polish
Treaty of Christmemel with the
Teutonic Knights. However, he changed sides and actively supported the 1432 coup against Švitrigaila in favor of
Sigismund Kęstutaitis. He then changed sides again and fought against Sigismund in the decisive
Battle of Wiłkomierz in 1435. Ivan was taken prisoner during the battle. Around 1444, he was invited by the
Novgorod Republic to govern their city. However, his reign lasted only about a year and his further fate is unknown. Ivan married Vasilisa
Olshanska, sister of Queen of Poland
Sophia of Halshany. They had three sons – Ivan (married Princess
Vorotynska), Simeon (married to daughter of Yury
Patrikeyevich and Maria
Vasilievna), Feodor – and three daughters. The daughters were married to
Bolesław II of Cieszyn, to Ivan
Ostrogski, and to the
voivode of Kiev Ivan Chodkiewicz. Of all three sons, only
Feodor Ivanovich Belsky is known to have left children. In 1481, Feodor,
Mikhailo Olelkovich, and Iwan
Olshanski-Dubrovicki planned a coup against Grand Duke
Casimir IV Jagiellon. Their plans were divulged; Mikhailo and Iwan were executed while Feodor succeeded in escaping to the
Grand Duchy of Moscow. His wife, Princess Kobrynska, who he had married but several months before the coup, was left in Lithuania. Feodor Belski lived at the Muscovite court until 1493, when he was implicated in the so-called Lukomsky Conspiracy to murder
Ivan III. He was banished to
Galich, but a year later he was pardoned and regained royal favor. Ivan III personally demanded from
Alexander of Lithuania to hand over Belsky's wife to him. Seeing no prospect of success, the Russian sovereign consulted the metropolitan and they declared Feodor's previous marriage null and void. Belsky then married Ivan's own niece, Anna of
Ryazan, daughter of
Vasily Tretnoy and
Anna of Ryazan. At the wedding, Feodor was rewarded with extensive
votchinas along the
Volga River, which would remain with his family until the
Oprichnina. In 1499, he was involved in the politics of the
Khanate of Kazan, hoping to install a khan backed by Moscow. He was last mentioned in the Russian chronicles in 1506, and it seems likely that he died shortly thereafter. Feodor's three sons Dmitry, Ivan and Simeon, being
Vasily III's cousins, took a key part in the events of his reign and the following regency. Feodor's elder brother,
Simeon Ivanovich Belsky, left Lithuania for the Grand Duchy of Moscow in his brother's wake in 1500, citing the persecution of Orthodox believers as his reason. His defection intensified anti-Lithuanian rhetoric in Russia, which proclaimed itself a defender of all Orthodox believers, and hastened the renewed
Muscovite–Lithuanian War. The war ended in 1503; Lithuania suffered large territorial losses, which included not only to
Bely but also
Chernigov,
Starodub, and
Homel. Thus the Belsky family regained its patrimony. == Kazan campaigns ==