Zosimus, New History 2.40
Zosimus (Greek Ζώσιμος): Early Byzantine, pagan author of a history of the Roman Empire, published in the first quarter of the sixth century CE.
The translation of Zosimus' New History offered here was printed in 1814 by W. Green and T. Chaplin in London, and was probably prepared by J. Davis of the Military Chronicle and Military Classics Office. The translator is anonymous. The text was found at Tertullian.org. The notes were added by Jona Lendering.
[2.40.1] The empire being thus divided, Constantius who appeared to take pains not to fall short of his father in impiety, began by shedding the blood of his nearest relations.
[2.40.2] He first caused Constantius, his father's brother, to be murdered by the soldiers. Next to whom he treated Dalmatius in the same manner, as also Optatus whom Constantine had raised to the rank of a Nobilissimate. Constantine indeed first introduced that order, and made a law, that every Nobilissimate should have precedence over of the prefects of the court.
[2.40.3] At that time, Ablabius prefect of the court was also put to death; and fate was just in his punishment, because he had concerted the murder of Sopatrus the philosopher, from envy of his familiarity with Constantine. Being unnatural towards all his relations, he included Hannibalianus with the rest, suborning the solders to cry out, that they would have no governors but the children of Constantine. Such were the exploits of Constantius.