1563. The Council of Trent in its session (xxv.) of 5th Dec. commits to the Pope the final arrangements concerning the details of the Breviary and Missal.
1568. The revised Roman Breviary published.
1570. The revised Roman Missal published.
1582. Reform of the Calendar by Gregory XIII. takes effect on 15th Oct.
1584. Publication by papal bull of 14th Jan. of the official Martyrologium Romanum prepared by Baronius.
1588. Sixtus V. institutes the Congregatio Rituum by the bull Immensa Æterni.
1596. Publication of the Pontificale Romanum.
1602. Clement VIII. takes steps for a revision of the Roman Breviary, and, in 1604, of the Roman Missal.
1608. Paul V. institutes the Feast of the Guardian Angels.