St Cassian the Greek, Wonderworker of Uglich (1504)

In 1473, Princess Sophia Paleologos came to Russia with a large retinue to marry Prince Ivan III. One of this retinue was a certain nobleman named Constantine, a relative of the last Byzantine Emperor, Constantine XI Paleologos. Constantine entered into the service of Archbishop Joasaph of Rostov, and in 1489 went with him on his retirement to the Monastery of St Therapont at White Lake. Constantine himself had no plans to become a monk; but on his first night at the monastery St Martinian (January 12) appeared to him, exhorting him to renounce the world immediately. Constantine reported his vision to the Archbishop, who confirmed its authenticity, and Constantine was tonsured a monk with the name Cassian.