Cyriacus I.

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Cyriacus ( Greek : Kyriakos; sometimes also called Cyrillianus) († 230 ) was Bishop of Byzantion .

The beginning of his term of office is usually dated to the year 217 (according to other information: 214). According to the information in the lists of bishops, he served 14 years under the emperors Macrinus , Elagabal and Severus Alexander . In the episcopate he replaced Philadelphus ; his successor was Castinus .

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predecessor Office successor
Philadelphus Bishop of Byzantium
217–230
Castinus