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The Bishops of Rome, Alexandria, Antioch, and Jerusalem, mentioned by Eusebius.
Church History (Historia Ecclesiastica) · Eusebius of Caesarea
(Dates taken from the table given by Lipsius in his Chronologie der röm. Bischöfe, p. 263 sq.)
EusHE 14.25.3
Marcellinus, 8 years 3 months 25 days; June 30, 296–(Oct. 25?), 304. Vacancy until 307.
EusHE 14.25.27
Eusebius, 3 (4?) months 23 (16?) days; April 23 (16?), 309–Aug. 17, 309. Vacancy until 310.
EusHE 14.25.31