7 dated entries naming Roman Catholicism, drawn from 7 separate years between 588 CE and 1950 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
588The Lombard Kingdom (Italy) is converted to Roman Catholicism under the rule of King Authari (approximate date).source
10th century
1000The papacy during this time was in a period of decline, in retrospect known as the saeculum obscurum ("Dark Age") or "pornocracy" ("rule of harlots"), a state of affairs that would result in the Great Schism between Roman Catholicism and Eastern Orthodoxy later in the 11th century.source
15th century
1492March 31 – Ferdinand and Isabella sign the Alhambra Decree, expelling all Jews from Spain unless they convert to Roman Catholicism.source
16th century
1527June 17 – The Protestant Reformation begins in Sweden. The Riksdag of the Estates in Västerås adopts Lutheranism as the state religion, in place of Roman Catholicism. This results in the confiscation of church property and dissolution of Catholic convents in accordance with the Reduction of Gustav I of Sweden.source
1581March 18 – The Parliament of England's Act against Reconciliation to Rome imposes heavy fines, for practising Roman Catholicism.source
17th century
1626February 11 – Emperor Susenyos of Ethiopia and Patriarch Afonso Mendes declare the primacy of the Roman See over the Ethiopian Church, and Roman Catholicism the state religion of Ethiopia.source
20th century
1950November 1 – Pope Pius XII witnesses the "Miracle of the Sun" at the Vatican and defines a new dogma of Roman Catholicism, the Munificentissimus Deus, which says that God took Mary's body into Heaven after her death (the "Assumption of the Blessed Virgin Mary").source