The Ecclesiastical History of Socrates Scholasticus

The Emperor Valens, little affected by the calamities resulting from the famine, went to Antioch in Syria, and during his residence there cruelly persecuted such as would not embrace Arianism. For not content with ejecting out of almost all the churches of the East those who maintained the ‘homoousian’ opinion, he inflicted on them various punishments besides. He destroyed a greater number even than before, delivering them up to many different kinds of death, but especially drowning in the river.