(I do not guarantee the accuracy of the following notes. WPT).
325 — Constantine. Compilation of ancient texts ; term IESU (other forms) accepted ; monastic orders adopted from the Buddhists.
349 — Latin mass,
400 — The Pope claims Keys to Christ,
558 — Extreme unction,
593 — Purgatory,
594 — Invocation of the Virgin,
709 — Kissing the Pope's toe,
715 — The Lamb on the Cross replaced by the Christ, the story of the crucifixion got — by one source — from the Zoroastrians ; (the hanging god was an idea relatively frequently met so far as I know).
1000 — Transubstantiation,
1054 — The Roman anathema laid on the altar of St. Sophia in Constantinople,
1074 — Celibacy of clergy,
1109 — Sale of indulgences,
1215 — Pope Innocent III ; confession taught ; the Inquisition,
1541 — Society of Jesus founded by I. Loyola,
ca. 1545 etc. — Reformation (by many authors),
1563 — Counterreformation by the Society of Jesus (Jesuit) in Bavaria,
1618 — 'Thirty Years War' by the Catholic princes, Austria, Germany, Spain, against the Protestants,
1648 — Peace of Westphalia, end war,