Zosimus, New History 4.19

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.

[4.19.1] Valentinian being dead, the tribunes Merobaudes and Equitius, reflecting on the distance at which Valens and Gratian resided, the former being in the east, and the latter left by his father in the western part of Gaul, were apprehensive lest the barbarians beyond the Ister should make an effort while the country was without a ruler. They therefore sent for the younger son of Valentinian, who was born of his wife the widow of Magnentius, who was not far from thence with the child. 

[4.19.2] Having clothed him in purple, they brought him into the court, though scarcely five years old. The empire was afterwards divided between Gratian and the younger Valentinian, at the discretion of their guardians, they not being of age to manage their own affairs. The Celtic nations, Spain, and Britain were given to Gratian; and Italy, Illyricum, and Africa to Valentinian.