At least by the Battle of Nedao, Triarius had withdrawn his support from Valamir, who was his relative and the king of the Ostrogoths.
Triarius joined the Eastern Roman army, where he rose to a prominent position.
His sister was married to the powerful general Aspar.
Triarius probably died in the 450s, and was succeeded by his son as leader of the Thracian Goths.
This biographical article about the military of the Byzantine Empire is a stub.