In 418, as comes, he suppressed a revolt in Palestine, and it was perhaps in view of this success that the following year, in 419, he was promoted to consul posterior, concurrently with Monaxius, and Magister militum praesentialis.
In 450 his daughter was given in marriage by Theodosius II to Constantius, the secretary of Attila.
In 432 he advised the Bishop of Antioch, John, to accept the mediation of Theodosius II and to reconcile with the Patriarch of Alexandria, Cyril.
Between 435 and 440 he asked the emperor to send him as ambassador, along with Flavius Dionysius, to Rugila, the King of the Huns.
After Rugila died, Plinta and Epigenes were sent to his successor, Attila, with whom they negotiated and concluded the Treaty of Margus or the Peace of Horreum Margi.