Career
Justin is mentioned in 528 as "stratelates of Moesia". He probably held the title of dux Moesiae Secundae and the rank of magister militum. He joined forces with Baduarius, dux of Scythia Minor, in battle against a force of foreign invaders, who John Malalas identifies as "Huns", while Theophanes the Confessor identifies as Bulgars.
Justin was killed in that battle and was succeeded in his post by Constantiolus.