Christian feast day: Aristobulus of Britannia (Roman Catholic Church)

Aristobulus of Britannia is a Christian saint named by Hippolytus of Rome (170–235) and Dorotheus of Gaza (505–565) as one of the Seventy Disciples mentioned in Luke 10:1–24 and as the first bishop in Roman Britain.

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. The Church consists of 24 sui iuris (autonomous) churches, including the Latin Church and 23 Eastern Catholic Churches, which comprise almost 3,500 dioceses and eparchies around the world, each overseen by one or more bishops. The pope, who is the bishop of Rome, is the chief pastor of the church.

March 15 is the 74th day of the year in the Gregorian calendar; 291 days remain until the end of the year.