Attalus could not provide the Goths with sufficient food and Alaric deserted him. After Alaric's negotiations with Honorius failed, the Goths sacked Rome on 24 August 410. The plundering of the Eternal City shocked the Romans although the Goths quickly abandoned it. Alaric decided to conquer Roman Africa, but he died before the end of the year. The Goths under his rule, now known as Visigoths, elected his brother-in-law Athaulf his successor. Maximus attacked Constantine in Gaul and the two usurpers' conflict gave Honorius' general Constantius the opportunity to intervene. Maximus withdrew to Hispania and Constantius captured Constantine at Arles. A Gallic aristocrat Jovinus secured the support of a coalition of Burgundians, Alans and other peoples and had himself proclaimed Augustus in Mainz. He allowed the Burgundians to establish their kingdom in Roman territory on the Middle Rhine. The Visigoths left Italy and joined the coalition supporting Jovinus in Gaul, but after Honorius promised grain supplies to them, Athaulf captured and beheaded Jovinus. He married Honorius' half-sister, Galla Placidia who had been captured during the sack of Rome. At the wedding, he reportedly declared the renewal of the Roman Empire "by the might of the Goths" as his main purpose, but a year later, in 415, he was murdered by a retainer. His successor Wallia agreed to fight against the Vandals and Alans in Hispania in return for food supply from the Romans.