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Gratian definitions

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Merriam Webster's

Latin Flavius Gratianus biographical name 359-383 Roman emperor (367-383)

Britannica Concise

Roman emperor (367-83). He originally shared the office with his father, Valentinian I (364-75), and his uncle, Valens (364-78). He later shared authority with his 4-year-old half brother, who was supported by the army. On his uncle's death he became ruler of the Eastern Empire, and summoned Theodosius I to share power with him. Influenced by St. Ambrose, Gratian omitted the words pontifex maximus ("supreme priest") from his title. He was murdered opposing the usurper Magnus Maximus.