Constantius, as has been narrated, departed this life groaning and grieving that he had been turned away from the faith of his father. Julian heard the news of his end as he was crossing from Europe into Asia and assumed the sovereignty with delight at having now no rival. In his earlier days, while yet a lad, Julian had, as well as Gallus
Christianity · Church History · Ecclesiastical History
Book III, Ch. 1 — Of the reign of Julianus; how from a child he was brought up in piety and lapsed into impiety; and in what manner, though at first he kept his impiety secret, he afterwards laid it bare.
Ecclesiastical History · Theodoret of Cyrus