This refers modestly to the legations undertaken by St. Ambrose on two separate occasions to Maximus, when the Empress Justina feared for the safety of herself and Valentinian. In his first mission, a.d. 383, he had at great personal risk induced Maximus not to invade Italy, but to leave Valentinian in peaceful possession of a share of the empire. In his second embassy, a.d. 387, he was less successful, as Maximus had determined on invading Italy; so that Justina and Valentinian escaped to the East, seeking the protection of Theodosius, who took their part, and defeated Maximus and put him to death at Aquileia, a.d. 388.