316 At the request of the Roman Catholic Church, Constantine attempts to end the schism with the Donatist church.
321 The Roman Catholic church is allowed to hold property.
627 April 11: Paulinus, a Roman missionary, baptizes King Edwin of Deira.
942 Pope Marinus II becomes 128th pope of the Roman Catholic Church
1103 The Scandinavian city of Lund becomes a see within the Roman Catholic Church
1159 In the Roman Catholic Church, Cardinals are given the right of election of the Pope. Prior to this, the pope was selected by election by the clergy and congregation of the church.
1179 Afonso I is recognized as the true King of Portugal by Pope Alexander III, bringing Portugal the protection of the Catholic Church against the Castilian monarchy.
1255 The final Cathar stronghold in southern France falls, eliminating the last refuge of the heretical Cathars after the Roman Catholic Church engaged in a program to crush the sect, starting in 1209 with the Albigensian Crusade.
1263 The doctrines of theologian Joachim of Fiore are condemned as heresy by the Roman Catholic Church at a synod in Arles.
1270 The ''Summa Theologiae'', a work by Thomas Aquinas that is considered within the Roman Catholic Church to be the paramount expression of its theology, is completed (year uncertain).
1274 The Second Council of Lyons, held by the leadership of the Roman Catholic Church convenes to consider the conquest of the Holy Land via Crusades and address the East-West Schism with the Byzantine church. The Council eventually approves a tithe to support efforts to conquer the Holy Land from Muslims, and reaches apparent resolution of the schism which ultimately proves unsuccessful.
1285 Archbishop Jakub Świnka orders all priests subject to his bishopry in Poland to deliver sermons in Polish rather than German, thus further unifying the Catholic Church in Poland and fostering a national identity.
1385 The Union of Krewo established the Jagiellonian dynasty in Poland and Lithuania through the marriage of Queen Jadwiga of Poland and Grand Prince Jagiello of Lithuania and saw the acceptance of Roman Catholicism by the Lithuanian elite.
1416 The Catholic Church burns Jerome of Prague as a hereti
1535 Sir Thomas More, author of Utopia and one time Lord Chancellor of England, is executed for treason by King Henry VIII after refusing to agree to Henrys' decision to separate the English church from the Roman Catholic church.
1616 Nicolaus Copernicus' ''De revolutionibus'' is placed on the Index of Forbidden Books by the Roman Catholic Church
1622 Albertus Magnus is beatified, and Teresa of Avila is canonized, by the Roman Catholic Church.
1673 The English Test Act was passed. It disallowed Catholics from holding high public offi
1687 King James II of England issues the Declaration of Indulgence, suspending laws against Catholics and non-conformists.
1789 Pope Pius VI appoints Father John Carroll (priest) the first Roman Catholic bishop in the United States.
1792 During what became known as the September Massacres of the French Revolution, rampaging mobs slaughtered three Roman Catholic Church bishops and more than two hundred priests.
1822 Galileo Galilei's ''Dialogue'' taken off the Index Librorum Prohibitorum, the Roman Catholic Church's list of banned books.
1845 The eminent and controversial Anglican, John Henry Newman, is received into the Roman Catholic Church
1903 Pope Pius X is elected Pope of the Roman Catholic Church.
1914 Giacomo della Chiesa is elected as the new Pope of the Roman Catholic Church. He becomes Pope Benedict XV.
1927 Cristero War erupts in Mexico when pro-Church rebels attack secular-minded government
1962 Second Vatican Council: Pope John XXIII convenes the first ecumenical council of the Roman Catholic Church in 92 years.
1963 The Roman Catholic Church accepts cremation as a funeral practi
1964 The Vatican condemns the female contraceptive pill.
1964 Second Vatican Council: The third period of the Catholic Church's ecumenical council closes.
1966 Off the coast of Spain in the Mediterranean, the Alvin submarine finds a missing American hydrogen bomb.
meeting the Catholic Pope]]
1966 Pope Paul VI and Arthur Michael Ramsey, the Archbishop of Canterbury, meet in Rome - the first official meeting for 400 years between the Roman Catholic and Anglican Churches.
1966 Pope Paul VI and Soviet Foreign Minister Andrei Gromyko meet in the Vatican - the first meeting between leaders of the Roman Catholic Church and the Soviet Union.
1984 The Vatican and the Italian government sign a new concordat disestablishing the Roman Catholic Church.
1999 Roman Catholic Church and Lutheran Church leaders sign the Joint Declaration on the Doctrine of Justification, ending a centuries-old doctrinal dispute over the nature of faith and salvation.