Gratianus in the midst of his successes in war and wise and prudent government ended his life by conspiracy. He left no sons to inherit the empire, and a brother of the same name as their father, Valentinianus, who was quite a youth. So Maximus, in contempt of the youth of Valentinianus, seized the throne of the West.
Christianity · Church History · Ecclesiastical History
Book V, Ch. 12 — Of the death of Gratianus and the sovereignty of Maximus
Ecclesiastical History · Theodoret of Cyrus