The events referred to happened ten years before the date assigned for this letter, when the Semi-Arians summoned Eudoxius to Lampsacus, and sentenced him to deprivation in his absence.  (Soc. H.E. iv. 2–4; Soz. H.E. vi. 7.)  On the refusal of Valens to ratify the deposition and ultimate banishment of the Anti-Eudoxians, Eustathius went to Rome to seek communion with Liberius, subscribed the Nicene Confession, and received commendatory letters from Liberius to the Easterns.  Soc. H.E. iv. 12.  Eudoxius died in 370.