Eusebius
/juːˈsiːbɪəs/- (c.264- c.340 AD) , bishop and Church historian; known as Eusebius of Caesaria. His Ecclesiastical History is the principal source for the history of Christianity (especially in the Eastern Church) from the age of the Apostles until 324.优西比乌斯（约公元264-约340, 主教、教会史学家, 通称恺撒利亚的优西比乌斯, 他的《基督教教会史》是有关早期基督教使徒时代至324年的基督教历史, 尤其是东正教会历史的主要原始资料来源）。