II. Constans was born in 380. The exact name of Constans is unknown. Constans became the emperor of the Roman state in 407.
In 406, Costantinus was assigned Constans to fight with barbarians. But Constans made a deal with the Visigoths. And Constans proclaimed himself a Roman emperor. Constans looted Vienna and Rome together with the Visigoths.
Constans was seen by the Roman people as a usurper. Constans was captured and executed by Roman soldiers in 411