 When the feast of Saint Thomas was inserted in the Roman calendar in the 9th century, it was assigned to 21 December.The "Martyrology of St. Jerome" mentioned the apostle on 3 July, the date to which the Roman celebration was transferred in 1969, so that it would no longer interfere with the major ferial days of Advent.Traditionalist Roman Catholics (who follow the General Roman Calendar of 1960 or earlier) and many Anglicans (including members of the Episcopal Church as well as members of the Church of England and the Lutheran Church, who worship according to the 1662 edition of the Book of Common Prayer), still celebrate his feast day on 21 December.