The Gregorian calendar, instituted by Pope Gregory XIII, went into effect in 1582. In the 1,417 years from 1583 through 3000, ...

To the north of St. Peter’s Square in the Vatican stands a tall structure called the Tower of the Winds, also referred to as ...

The alignment of Easter in Western and Eastern branches of Christianity, along with a 1,700-year anniversary, have renewed ...

The Gregorian calendar, instituted by Pope Gregory XIII, went into effect in 1582. In the 1,417 years from 1583 through 3000, it’s most common for Easter to fall on April 16, with 61 instances.

Benedict IX, a pope in the 11th century, holds the rare distinction of becoming a pope three times, selling the papacy, being ...

Peter was the first pontiff of the Catholic church, and several popes have been considered "great" in the interim.

The Eastern Orthodox and Roman Catholic observances overlap only every three to four years thanks to different church ...

But the two churches started using different calendars after Pope Gregory XIII’s adaptation in 1582, when the Western church adopted the Gregorian calendar while the Eastern Orthodox Church kept ...