The following is a list of the feast days of the General Roman Calendar as it was in 1954. It is thus basically that established by Pope Pius X (1903–1914), but it also incorporates changes that were made by Pope Pius XI (1922–1939), such as the institution of the Feast of Christ the King, while not including those made in 1955 by Pope Pius XII (1939–1958). The General Roman Calendar was again revised in 1969. For this revision and the later addition of celebrations of saints such as Martin de Porres, Maximilian Kolbe and Pio of Pietrelcina, see Roman Catholic calendar of saints.