Venerable Kassianos the Greek, wonderworker of Uglich.
Kassianos was a Greek nobleman named Constantine who came to Moscow in the entourage of Sophia Palaiologina. He became a monk at the Ferapontov Monastery and later founded a monastery near Uglich on the Volga.
He reposed in 1504 and is honored as a wonderworker by the Russian Church.
Feast day
On the New Calendar, Kassianos the Greek is commemorated on May 21. Churches on the Old (Julian) Calendar keep the feast on June 3 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Also commemorated on May 21

Constantine and Helen
Great Feast, Κωνσταντίνος και Ελένη
Equal-to-the-Apostles Emperor Constantine the Great and his mother Helen.
Name days: Konstantinos, Kostas, Kostis, Dinos, Konstandinos, Constantine, Costas, Costa, Gus, Konstantin, Eleni, Elena, Helen, Elli, Lena, Heleni, Konstantina, Constantina, Dina, Ntina, Kostoula, Helena, Ellen, Elenitsa, Nitsa, Lenio
Pachomios the New Martyr
Martyr, Παχώμιος ο Νέος
Venerable Martyr Pachomios of Ousaki, an Athonite monk beheaded for Christ.
Constantine of Murom with his sons Michael and Theodore
Saint, Κωνσταντίνος του Μουρόμ
Holy Princes Constantine, Michael and Theodore of Murom, enlighteners of that region.
Christopher of Antioch
Hierarch, Χριστόφορος Αντιοχείας
Hieromartyr Christopher I, Patriarch of Antioch, murdered for his faith.
Timothy, Polios and Eutychios
Martyr, Τιμόθεος, Πόλιος και Ευτύχιος
Holy Martyrs Timothy, Polios and Eutychios, deacons of Africa.