Nicholas Cabasilas was a Byzantine priest, philosopher, and mystic who lived during the 14th century. Born in Thessaloniki, he eventually moved to Constantinople, where he was likely a priest at the Mangana Monastery. He maintained a close relationship with Emperor John VI Kantakouzenos and was a prominent supporter of Gregory Palamas and the Hesychast movement. His theological contributions remain highly regarded within the Eastern Orthodox tradition, where he is recognized as a saint.