Bishop of Philippi in Macedonia. Exiled by Arians. Missionary to the area of modern Germany where he worked with Saint Alban of Mainz. Forced to flee ahead of invading Vandals. When the Vandals caught up to Theonestus, he was murdered for his fidelity to the faith. Martyr.
- Book of Saints, by the Monks of Ramsgate
- Catholic Online
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Theonestus of Philippi“. Saints.SQPN.com. 29 October 2013. Web. 22 August 2014. <>