Cyriacus I of Byzantium

Cyriacus I of Byzantium (Greek: Κυριακός; died 230) succeeded Philadelphus of Byzantium as bishop of Byzantium and governed the local church for 13 years (217 – 230); in some catalogues appears under the name Cyrillianus or Kyriacos.^[1]

Cyriacus I of Byzantium
Bishop of Byzantium
Installed	217
Term ended	230
Predecessor	Philadelphus of Byzantium
Successor	Castinus of Byzantium
Personal details
Died	230
Denomination	Early Christianity