December 30, 41 Titus was born. He was Roman emperor from 79-81 and during his reign the Coliseum was completed. 1370 Pope Gregory XI elected pope. Gregory attempted to foster peace between England and France during the Hundred Years' War, defeated Florence in its war against the Papal States, and returned the papacy to Rome from Avignon. 1460 The Lancastrians routed the Yorkists at the Battle of Wakefield, and executed Richard, Duke of York.