Gregory Palamas (1296-1359) is venerated as a saint by Eastern Orthodoxy. Palamas was a monk of Mount Athos in Greece (at Vatopedi Monastery and Esphigmenou Monastery), and later became Archbishop of Thessalonica. He was a preeminent theologian and a proponent of hesychastic theology. His feast days in the Church are November 14 and the second Sunday of Great Lent.