Born circa 263 CE, Eusebius was a Greek historian of early Christianity. A bishop of Caesarea, Palestine, he may have been imprisoned during the Roman persecutions. His fame rests on his Ecclesiastical History, which preserves portions of works no longer extant. He was a staunch supporter of Constantine I’s attempts to unify Christian doctrine, and his writings include Life of Constantine. Eusebius was excommunicated in 325 CE, after being accused of espousing what doctrine? Discuss