Rosi de Vaticano By Cherish2114 Dec 24, 1978 Was first known as "Ager Vaticanus" in the 2nd century A.D. Dec 24, 1978 Recognized the Christian religion in Milan of 313 A.D. Dec 24, 1978 Between 1477 and 1480 Pope Sixtus IV started building a chapel, named "Sistina" Dec 24, 1978 Julius II (1503-1513) began to work on St. Peters Basilica Dec 24, 1978 Pope Julius had Raphael and Michaelangelo paint the frescos in the sistine chapel Dec 24, 1978 Saint Peters Basilica was completed by Michelangelo by mid-16th century. Dec 24, 1978 Cardinals elect the pope Dec 24, 1978 The pope then holds the power of the legislative, executive, and judicial branches.