Constans II (died early 411) was caesar or heir apparent to his father Emperor Constantine III from 407 to 409 and co-emperor with Constantine and the Western Roman Emperor Honorius from 409 until his death. Constans was a monk prior to his father being acclaimed emperor by the army in Britain in early 407. Constans was summoned to the new imperial court, in Gaul, appointed to the position of Caesar and swiftly married so that a dynasty could be founded. In Hispania, Honorius's relatives rose in 408 and expelled Constantine's administration. An army under the generals Constans and Gerontius was sent to deal with this and Constantine's authority was re-established. Honorius acknowledged Constantine as co-emperor in early 409 and Constantine immediately raised Constans to the position of co-emperor, theoretically equal in rank to Honorius as well as to Constantine. Later in 409 Gerontius rebelled, proclaimed his client Maximus emperor and incited barbarian groups in Gaul to rise up. Constans was sent to quash the revolt, but was defeated and withdrew to Arles. In 410, Constans was sent to Hispania again. Gerontius had strengthened his army with barbarians and defeated Constans; the latter withdrew north and was defeated again and killed at Vienne early in 411. Gerontius then besieged Constantine in Arles. Background Following the death of the Roman emperor Theodosius I in 395 the Roman Empire was divided between his two sons: Arcadius became emperor of the Eastern Roman Empire and ten-year-old Honorius of the Western. Honorius was underage and the leading general Stilicho became hugely influential and the de facto commander-in-chief of the Roman armies in the west. Both the Eastern and Western Empires were suffering from incursions of large groups from Germanic tribes, whom the Romans referred to generically as "barbarians". During this period Roman Britain was suffering raids by the Scoti, Saxons and Picts. In 401 or 402 Stilicho needed military manpower for wars with the Visigoths and the Ostrogoths and so stripped Hadrian's Wall of troops. Prelude In 406 the approximately 6,000 troops of the Roman field army based in Roman Britain were dissatisfied. They had not been paid for several years, a large contingent had left to fight on the continent four years earlier and had not returned, the coastal defences had been dismantled to form the new field army and their commander had been replaced. They revolted and determined to choose their own leader.