[1] All that is definitely known of Eusebius is gathered from the letters of Basil the Great and of Gregory Nazianzen, and from some incidents in the "Ecclesiastical History" of Theodoret.

[3] When Meletius expounded his orthodoxy, the bishops persuaded the Roman emperor Constantius II, a staunch Arian, to extort the record from Eusebius and destroy it.

[3] During the persecution of orthodox Christians under Julian the Apostate, Eusebius travelled incognito through Syria, Palestine and Phoenicia disguised as a military officer, ordaining presbyters and deacons.

[2] Orthodox Christians experienced a short respite during the brief reign of Jovian, but in 374 the emperor Valens, an Arian, banished Eusebius to Thrace, in the Balkan Peninsula.

While in Dolikha to consecrate a bishop, he was killed after being struck on the head with a roof tile thrown by an Arian woman.