Event Factoid: Basil wrote a letter to
Urbicius
on the subject of refraining from communion with heretics.
Sources:
Ernest Walter Brooks,The Sixth Book of the Select Letters of Severus, Patriarch of Antioch, in the Syriac
Version of Athanasius of Nisibis. Translation, Part II: Letters III.1-XI.1, vol. 2.2 (London: Williams and Norgate, 1904), part: V.5, p: 291.