At the same time Honorius was clashing with the Visigothic King Alaric (who would sack Rome in 410), Picts invaded Britain, and Vandals, Alans and Suebi devastated Gaul. Honorius, in Ravenna, no longer even ruled the city of Rome; Visigoths had forced the Senate to appoint Priscus Attalus emperor. Out of desperation, the remnants of legions in the Britain elevated Constantine III and his son Constans II to the purple. Although Iberia was initially spared, in 409 Vandals and other barbarians laid waste to that land too. Constans II, who had been in Hispania, fled back to join his father in Gaul. Their general, Gerontius, remained in Spain, allied with the Vandals, and appointed Maximus as his own puppet emperor. Maximus was probably a senior staff officer, and may have also been a relative, possibly his son. Maximus was one of six men claiming to be Emperor in 410: Honorius (in Ravenna, the legitimate emperor of the West), Theodosius II (in Constantinople, the legitimate emperor of the East), Priscus Attalus (in Rome), Constantine III (in Arelatum), Constans II (in Vienne), and Maximus (in Barcino). Gerontius besieged, defeated and executed Constans II at Vienne. The general then besieged Constantine III at Arles, but the forces of Honorius joined the fight and defeated him. Gerontius was trapped and committed suicide. Maximus fled to his barbarian allies in Hispania who protected him until he was pardoned by Honorius. In 420, Maximus Tryannus rebelled in Hispania (it's uncertain that this was the same Maximus), but was quickly captured, taken to Ravenna, and executed by Honorius 422.