This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Castinus of Byzantium" – news · newspapers · books · scholar · JSTOR (April 2020) (Learn how and when to remove this template message)
Castinus of Byzantium
Bishop of Byzantium
Term ended237
Personal details
DenominationEarly Christianity

Castinus I (? – 237) was Bishop of Byzantium between 230 and 237. In some catalogues he appears as Constantine.

He was a senator from Rome, who initially was not a Christian. He converted to Christianity, being baptised by the bishop of Argyropolis, Cyrillianus. From then on he gave his fortune to the poor and was devoted to the Church. He was bishop of Byzantium from 230 to 237. Until his tenure, the cathedral was near the sea in the area of present Galata. He built one of the oldest churches in Byzantium to honour Saint Euphemia.[1]

Nicephorus Callistus refers to him in his works as Constantine.

His memory is revered on January 25.


  1. ^ Van Millingen, Alexander (1899). Byzantine Constantinople. J. Murray. p. 207.


Titles of the Great Christian Church Previous:Cyriacus I Bishop of Byzantium 230–237 Next:Eugenius I