Feodor Belski lived at the Muscovite court until 1493, when he was implicated in the so-called Lukomsky Conspiracy to murder Ivan III.
Seeing no prospect of success, the Russian sovereign consulted the metropolitan and they declared Feodor's previous marriage null and void.
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.
The war ended in 1503; Lithuania suffered large territorial losses, which included not only to Bely but also Chernigov, Starodub, and Homel.
Two years later, the Crimean khan had Shahgali replaced with his own brother, defeated Belsky's army on the banks of the Oka River and devastated the area between Moscow and Kolomna.
While Belsky retreated to the stronghold of Serpukhov, his absence from the capital left the field free for mutual jealousies and accusations.
Belsky's huge army spent 20 days encamped at the island opposite Kazan, awaiting the arrival of Russian cavalry.
Many boyars proceeded to accuse him of treason, but modern historians agree there was little he could achieve without provisions, being pressed to repel continuous attacks by Tatar and Udmurt cavalry.
Matters then remained quiet until 1530, when Ivan Belsky, still eager to revenge himself, returned with the Russian army to the walls of Kazan.
After Grand Prince's death, a political struggle erupted between his widow Elena Glinskaya and his brother Yury of Dmitrov, with whom the Belskys were on friendly terms.
In 1540, Ivan Belsky was again thrown into prison, only to be released several months later, after the death of Vasily "Nemoy" Shuisky and on petition from Metropolitan Joasaphus.
The khan, persuaded by Simeon that Moscow stood completely unfortified and desiring to profit from the attendant disorder, advanced with his guards towards the Russian capital.
His hope of putting Moscow to the sword proved ill-founded, however, and he retreated on espying the first contingent of the Russian soldiers and taking Simeon Belsky back with him.
When the Oprichnina was instituted, the tsar had his two noblest boyars, Ivan Belsky and Fyodor Mstislavsky, appointed to run the lands of the state, or zemshchina.
Ivan Belsky and Marfa Shuiskaya had five children but they all died in minority and were interred in the family sepulcher, Tikhon's Hermitage near Kaluga.
In 1571, when khan Devlet I Giray of Crimea assaulted Moscow and set the city on fire, Prince Belsky suffocated from smoke in his own mansion.