Apollinaris Claudius was a 2nd-century Christian bishop and writer from Hierapolis in Phrygia. Known as an apologist, he gained recognition for his polemical works, which aimed to demonstrate that certain contemporary errors were merely borrowed from pagan traditions. During the reign of Marcus Aurelius, he authored an apology for the Christian faith, specifically addressing the emperor by referencing the military successes attributed to Christian prayers. Although much of his written work is lost, his historical presence is noted by early chroniclers like Eusebius.
Life and works

Serving as a presbyter and later as a bishop, Apollinaris focused on defending Christian doctrine. His most notable surviving evidence includes fragments of his writings, particularly a passage concerning the timing of Passover. He wrote to the Roman leadership to defend his faith, citing the divine assistance provided to the Thundering Legion during their conflict with the Quadi as proof of Christian efficacy.
Veneration
He is recognized as a saint within the Anglican, Catholic, and Orthodox traditions. His memory is preserved through the liturgical calendar, with his feast day observed on January 8. His legacy as a defender of the faith continues through the historical accounts of his intellectual contributions to early Christian apologetics.
