Saint John of Dailam (Syriac: ܝܘܚܢܢ ܕܝܠܡܝܐ‎ Yoḥannan Daylamáyá), was a 7th-century East Syriac Christian saint and monk, who founded several monasteries in Mesopotamia and Persia. According to the hagiographical Syriac Life of John of Dailam, John was born in Ḥdattā, a town on the confluence of the Upper Zab and the Tigris, in AD 660.He joined the monastery of Bēṯ ʿĀbē at a young age. He was later captured by the Dailamites who were at war with the invading Arabs and was carried away to the Daylam region in southern shores of the Caspian Sea. He broke away from captivity and went on preaching in the area spreading Christianity among its inhabitants.