Roman emperor Valentinian II (pictured) was found hanged in his residence in Vienne, in present-day France. Valentinian II: Valentinian II was a Roman emperor in the western part of the Roman Empire between AD 375 and 392. He was at first junior co-ruler of his half-brother, then was sidelined by a usurper, and finally became sole ruler after 388, albeit with limited de facto powers. He was the youngest emperor (co-ruler) in the Western Roman Empire. May 15, 392. Wiki link