The Feast of the Exaltation of the Holy Cross, celebrated every year on 14 September, recalls three events: 1. The finding of the True Cross by Saint Helena, 2. The dedication of churches built by Emperor Constantine on the site of the Holy Sepulcher and Mount Calvary, 3. The elevation of the True Cross at Hagia Sophia in Constantinople in AD 629 by the Byzantine emperor Heraclius, after it...