(d. after 360),
Bp. of Thmuis in the Nile delta from c.339. He had been a monk and companion of St Antony. St Athanasius chose him for a difficult mission to the Emp. Constantius and addressed to him a series of letters on the Divinity of the Holy Spirit. Serapion wrote against the Manichees, and a Sacramentary which has come down under his name was probably his compilation. Feast day, 21 Mar.
Subjects: Christianity — Medieval and Renaissance History (500 to 1500).