[1] He accompanied Julian on his march through Illyricum to quell what remained of the government of Constantius II that year.
The council of military officers (including Dagalaifus) finally agreed on the new comes domesticorum, Jovian, to succeed Julian.
[5] As emperor, Jovian quickly arranged an end to the Persian hostilities on terms that were far from advantageous to Rome.
Following the death of Jovian after only several months’ rule, Dagalaifus was again influential in the election of Valentinian as the next Roman Emperor.
[8] In the winter of late 365, Valentinian learned that the Alemanni had crossed the Rhine and defeated his armies in eastern Gaul around Moguntiacum (Mainz).