Eusebian adjective 2noun 1forms 3 adjective2 •Of or relating to Eusebius of Caesarea (c. AD 263–339), Ancient Roman historian, exegete, and Christian polemicist. •Of or relating to Eusebius of Nicomedia (died 341), bishop of Berytus (modern-day Beirut) in Phoenicia. noun1 •A follower of Eusebius. formsEusebians · more Eusebian · most Eusebian