Person Factoid
https://spear-prosop.org/3025-7Citizenship:
Callistus was an archdeacon.
Sources:
- E. W. Brooks (ed.), Translation, The Sixth Book of the Select Letters of Severus Patriarch of Antioch in the Syriac Version of Athanasius of Nisibis vol. 2.1 (Oxford: Williams and Norgate, 1903), p: 17.