A statement of faith used in the W. Church. Like other early Creeds, it falls into three sections concerned with God the Father, Jesus Christ, and the Holy Spirit. Its title is first found in a letter of St Ambrose, c.390, by which time the legend of its joint composition by the Apostles was current. By the early Middle Ages it was everywhere employed at Baptism in the W., and between the 7th and 9th cents. it secured a place in the daily offices. In modern times it has been treated in discussions about Church union as a binding formulary of faith.