The Apology of Aristides was written by the early Christian writer Aristides (fl. 2nd century). Until 1878, our knowledge of Aristides was confined to some references in works by Eusebius of Caesarea and Saint Jerome. Eusebius said that he was an Athenian philosopher and that Aristides and another apologist, Quadratus, delivered their Apologies directly to the Emperor Hadrian. Aristides is also credited with a sermon on Luke 23:43. Aristides remained a philosopher after his conversion to Christianity, and he continued to work as a philosopher in Athens.