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Marcus I of Byzantium
Bishop of Byzantium
Installed	198
Term ended	211
Predecessor	Olympianus of Byzantium
Successor	Philadelphus of Byzantium
Personal details
Denomination	Early Christianity

Marcus I (Greek: Μᾶρκος; died 211) was the bishop of Byzantium for 13 years (198–211 AD). He succeeded Bishop Olympianus. His term of office took place during the persecution of Christians by Emperor Septimius Severus. His successor was Philadelphus.