The Feast of Christ the King is a Christian observance celebrating Jesus Christ as lord over all creation, and it marks the end of the liturgical year. Established by Pope Pius XI in 1925, it was originally in late October but moved to the last Sunday of Ordinary Time, immediately before Advent, in 1969. The feast emphasizes that Christ's rule is not political but spiritual, based on truth, love, and peace, and serves as a response to the rise of secularism and nationalism in the early 20th century.