An apocryphal book recounting the missionary activities of the Apostle St Thomas. Gundaphorus, an Indian king, sent a merchant to Syria to obtain a skilled architect. The merchant met Jesus, who recommended Thomas; Thomas agreed to go back with him. Gundaphorus and many others were converted. Thomas was eventually killed for persuading Mygdonia to cease marriage relationships with her husband. The Acts contain two hymns, including the famous ‘Hymn to the Redeemer’ (108–13; now usually called the ‘Hymn of the Pearl’) and two hymnic invocations relating to Baptism (27) and the Eucharist (50). The work was Gnostic in origin, apparently dates from before the middle of the 3rd cent., and was probably written in Syriac.