Historia Arianorum

Perceiving this to be the case, the three brothers, Constantine, Constantius, and Constans, caused all after the death of their father to return to their own country and Church; and while they wrote letters concerning the rest to their respective Churches, concerning Athanasius they wrote the following; which likewise shows the violence of the whole proceedings, and proves the murderous disposition of Eusebius and his fellows.

A copy of the Letter of Constantine Cæsar to the people of the Catholic Church in the city of the Alexandrians.

I suppose that it has not escaped the knowledge of your pious minds, etc.

This is his letter; and what more credible witness of their conspiracy could there be than he, who knowing these circumstances has thus written of them?