Evagrius was bishop

Bishop

A bishop is an ordained or consecrated member of the Christian clergy who is generally entrusted with a position of authority and oversight. Within the Catholic Church, Eastern Orthodox, Oriental Orthodox Churches, in the Assyrian Church of the East, in the Independent Catholic Churches, and in the...

 of Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

 for brief periods in 370, and possibly 380.

Little is known about Evagrius. In 370, the Arians

Arianism

Arianism is the theological teaching attributed to Arius , a Christian presbyter from Alexandria, Egypt, concerning the relationship of the entities of the Trinity and the precise nature of the Son of God as being a subordinate entity to God the Father...

 elected Demophilus

Demophilus of Constantinople

Demophilus was bishop of Berea and bishop of Constantinople from 370 until expelled in 380.-Biography:Born of good family in Thessalonica, he was elected by the Arians to the bishopric of Constantinople. The opinion of the populace, however, were much divided...

 to fill the bishopric vacancy after the death of Eudoxius

Eudoxius of Antioch

Eudoxius was the eighth bishop of Constantinople from January 27, 360 to 370, previously bishop of Germanicia and of Antioch, and was one of the most influential Arians.-Biography:...

. The Catholic

Catholic

The word catholic comes from the Greek phrase , meaning "on the whole," "according to the whole" or "in general", and is a combination of the Greek words meaning "about" and meaning "whole"...

s and the deposed bishop of Antioch Eustathius

Eustathius of Antioch

Eustathius of Antioch, sometimes surnamed the Great, was a bishop and patriarch of Antioch in the 4th century.He was a native of Side in Pamphylia. About 320 he was bishop of Beroea, and he became patriarch of Antioch shortly before the Council of Nicaea in 325...

 chose Evagrius for that see

Episcopal See

An episcopal see is, in the original sense, the official seat of a bishop. This seat, which is also referred to as the bishop's cathedra, is placed in the bishop's principal church, which is therefore called the bishop's cathedral...

; but a few months later he was banished by the emperor

Roman Emperor

The Roman emperor was the ruler of the Roman State during the imperial period . The Romans had no single term for the office although at any given time, a given title was associated with the emperor...

 Valens

Valens

Valens was the Eastern Roman Emperor from 364 to 378. He was given the eastern half of the empire by his brother Valentinian I after the latter's accession to the throne...

, and remained in exile until his death.

Some sources claim that he was elected a second time in 379 or 380, after the expulsion of Demophilus by emperor Theodosius I

Theodosius I

Theodosius I , also known as Theodosius the Great, was Roman Emperor from 379 to 395. Theodosius was the last emperor to rule over both the eastern and the western halves of the Roman Empire. During his reign, the Goths secured control of Illyricum after the Gothic War, establishing their homeland...

.