Olympianus was the bishop of Byzantium for eleven years (187-198 AD). He succeeded Bishop Pertinax

Pertinax of Byzantium

Pertinax was Bishop of Byzantium from 169 until his death in 187. Information on his life is mainly drawn from the works of Dorotheus of Tyre, according to whom he was originally a senior officer of the Roman Empire based in Thrace...

. In 196 Byzantium

Byzantium

Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

 was conquered by Emperor Septimus Severus during his rivalry with Pescennius Niger

Pescennius Niger

Pescennius Niger was a Roman usurper from 193 to 194 during the Year of the Five Emperors. He claimed the imperial throne in response to the murder of Pertinax and the elevation of Didius Julianus, but was defeated by a rival claimant, Septimius Severus and killed while attempting to flee from...

. Septimus Severus took the right of metropolis from the city and made it part of the Heracleia. Byzantium remained a bishopric under Heracleia for more than a century.

Olympianus' successor was Marcus I

Marcus I of Byzantium

Marcus I was the bishop of Byzantium for 13 years . He succeeded Bishop Olympianus. His term of office took place during Emperor Septimus Severus' persecution of Christians. His successor was Philadelphus.-Sources:*...

.

Sources

• www.ec-patr.org