Historical Sources
Marinus is one of the better-documented pre-Nicene martyrs because Eusebius of Caesarea included his story in the Historia Ecclesiastica, the foundational history of the early Church. Eusebius was writing in the same city where Marinus died and had access to local records and oral tradition. The account in Book 7, chapters 15-16, is notable for including the detail of the bishop's symbolic choice between the sword and the Gospel — a scene that became emblematic in later Christian reflection on the tension between military service and Christian allegiance.
The role of Astyrius is also attested by Eusebius, who notes that Astyrius was a distinguished man of senatorial rank who had recently arrived from Rome and was known to the imperial household. Whether Astyrius was himself subsequently martyred is not established; Eusebius presents him as a venerable figure but does not describe a martyrdom for him.