For 10 points, name this man perhaps most famous as a historian, the author of Ecclesiatical History.
He sheltered Arius after that heretic had been expelled from Alexandria, and consequently he was excommunicated in 325 CE. However, later that year, this bishop of Caesarea was exonerated at the Council of Nicaea, with the explicit approval of Constantine I. For 10 points, name this man perhaps most famous as a historian, the author of Ecclesiatical History.
He sheltered Arius after that heretic had been expelled from Alexandria, and consequently he was excommunicated in 325 CE.
Eusebius of Caesarea