Theodorus (; ) was a Christian biblical scholar of the mid-4th century AD. He was bishop of Heraclea in Thrace (also called Perinthus or Heraclea in Europa; modern Marmara Ereğlisi), being appointed some time between 328 and 334; he was an ally of Eusebius against the Athanasians.Cain, A. (2021:164). Jerome's Commentaries on the Pauline Epistles and the Architecture of Exegetical Authority. United Kingdom: Oxford University Press. He should not be confused with Theodore Stratelates (281–319), sometimes called "Theodore of Heraclea"; Theodore Stratelates lived in Heraclea Pontica.
In Jerome's De viris illustribus, he writes that Theodorus wrote the following works during the reign of Constantius II (): On Matthew and John (fragments of which survive) On the Epistles On the Psalter
He was deposed in AD 347 and died around 355.Ellis, G. I., Brooke, T. (1891:416). A Catalogue of the Manuscripts and Printed Books Collected by Thomas Brooke and Preserved at Armitage Bridge House, Near Huddersfield. United Kingdom: Ellis and Elvey.Oden, T. C. (2007:xxv). The Good Works Reader. United Kingdom: Eerdmans Publishing Company.
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