Sophia Palaiologina

Zoe Palaiologina (c. 1449–1503), known in Russia as Sophia Fominichna, was a Byzantine princess, niece of the last emperor Constantine XI and daughter of Thomas Palaiologos. After the Ottoman conquest of the Morea in 1460 she was raised in Rome under papal protection. In 1472 she married Grand Prince Ivan III of Moscow.

In 1502 she saw her son Vasily III made co-ruler after the downfall of the rival heir Dmitry. She died in Moscow in 1503.