John of Damascus
Approx. 675 AD — December 4, 749 AD · Feast day: December 4
Born the son of a senior Umayyad court official in 7th-century Damascus, John of Damascus left wealth and influence to become a monk at Mar Saba, where he composed the theological synthesis that shaped Catholic and Orthodox Christianity for a millennium. His written defense of sacred images, composed safely inside a Muslim caliphate, proved decisive in the iconoclast controversy.