155 A.D.
Death of Pope Saint Pius I, 10th successor of Peter, as a martyr of the faith during the persecution of Roman Emperor Titus. Pius' rules for the conversion of Jews are considered to be important in Church evangelization.
547 A.D.
Death of Saint Benedict, abbot and religious founder who is also known as the father of western monasticism. For more on this founder of the Benedictines, see LITURGY.
969 A.D.
Death of Saint Olga, who is also known as Saint Helga. This Russian saint married the prince of Kiev and became ruler of Kiev after his murder which she avenged. She repented of her revenge when she became a Christian in 957 and changed her ways, moving many to convert to Christianity. Her greatest convert was her grandson Vladimir who would go on to evangelize Russia after her death at Kiev.
1276 A.D.
Cardinal Ottobono Fieschi, through the strong influence and meddling of the Sicilian King Charles of Anjou, becomes the 186th successor of Peter and chooses the name Pope Hadrian V. Though his pontificate lasted only 39 days, he was never actually consecrated. He put ecclesiastical laws in order and suspended Pope Gregory X's norms concerning the conclave, which in future elections would be greatly debated.
1533 A.D.
Pope Clement VII, despite trying every measure to persuade the king of England, has no choice but to excommunicate Henry VIII and declare his divorce from Catherine of Aragon null and void, upholding the insolubility of the sacrament of matrimony.