The Martyrdom of Marinus is an anonymous Christian text from Late Antiquity, likely compiled in the 4th or 5th century CE. It is a prose narrative that recounts the execution of a Christian soldier named Marinus in Caesarea Maritima during the Roman persecutions under emperors Valerian and Gallienus in the mid-3rd century. The author’s role was to preserve and narrate this story of faith for the edification of the Christian community.

The work survives not as a standalone manuscript but as a passage quoted within the Ecclesiastical History written by Eusebius of Caesarea, who recorded it in the early 4th century. This indicates the story circulated in earlier oral or written form before being included in Eusebius’s history. The narrative describes how Marinus, a distinguished soldier next in line for promotion, was accused of being a Christian. After refusing to renounce his faith following counsel from a bishop, he was executed.

According to modern scholars, the text’s significance lies in its value as a historical source. It provides a specific example of the conflict between Christian belief and Roman military service during the Valerianic persecution, illustrating the legal and social procedures used against Christians. As a typical example of early martyr literature, it served to commemorate a local saint, reinforce Christian identity, and inspire believers through a model of steadfast faith.