Valentinian goes into the West; Valens remains at Constantinople, and grants the Request of the Macedonians to hold a Synod, but persecutes the Adherents of the 'Homoousion.'
Of the emperors one, i.e. Valentinian, speedily went to the western parts of the empire; for the exigencies of affairs required his presence there: meanwhile Valens, residing at Constantinople, was addressed by most of the prelates of the Macedonion heresy, requesting that another Synod might be convened for the correction of the creed. The emperor supposing they agreed in sentiment with Eudoxius and Acacius, gave them permission to do so: they therefore made preparations for assembling in the city of Lampsacus.
But Valens proceeded with the utmost dispatch toward Antioch in Syria, fearing lest the Persians should violate the treaty into which they had entered for thirty years in the reign of Jovian, and invade the Roman territories. They however remained quiet; and Valens employed this season of external tranquillity to prosecute a war of extermination against all who acknowledged the homoousion. Paulinus their bishop, because of his eminent piety, he left unmolested. Melitius he punished with exile: and all the rest, as many as refused to communicate with Euzoïus, he drove out from the churches in Antioch, and subjected to various losses and punishments. It is even affirmed that he caused many to be drowned in the river Orontes, which flows by that city.
Source: Ecclesiastical History (New Advent)