The Holy Qurbana of Addai and Mari belongs to the East Syrian liturgical family (see Syriac Christianity) and is in regular use in the Assyrian Church of the East, the Syro-Malabar Catholic Church and the Chaldean Catholic Church. Saint Addai (disciple of Saint Thomas the Apostle) and Saint Mari (a disciple of Saint Addai) are credited with having written it. The Holy Qurbana of Addai and Mari is one of the oldest Eucharistic prayers in the Christian Church, possibly dating back to 3rd-century Edessa.