December 4
Saint John Damascene is invoked as patron of icon-painters. Mansur ibn Sarjun, known to the Church as John of Damascus, was born around 675 in Damascus, capital of the new Umayyad Caliphate. His Christian Arab family held the high civil office of Mansur (treasurer) at the caliph's court, an office his grandfather had held under the Byzantines and continued to hold under Muslim rule. Sources: https://www.usccb.org/resources/2026cal.pdf.