Bishop of Beth-Seleucia, he was known for the number of converts he brought to the faith. Denounced for interfering with the Persian star worship, and suspected of treasonous collaboration with Roman authorities, he was arrested in 339. Tried before King Shapur II, they were given the chance to save themselves by denouncing their faith; they declined. Martyr.
- Book of Saints, by the Monks of Ramsgate
- Katherine Rabenstein
- Lives of the Saints, by Father Alban Butler
- Medieval Listserv
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Isaac of Beth-Seleucia“. CatholicSaints.Info. 3 September 2013. Web. 25 July 2016. <>