At the conclusion of the Christian year, the church gives thanks and praise for sovereignty of Christ, who is Lord of all creation and is coming again in glory to reign (see Revelation 1:4-8).

This festival was established in 1925 by decree of Pope Pius XI. Originally it took place on the last Sunday in October, just prior to All Saints’ Day. Now it is celebrated on the last Sunday of the Christian year, a week before the season of Advent begins.

Excerpt taken from the Presbyterian Church USA website.