マギステル・ミリトゥム
Constantius III, who became "Magister militum" by 411, restored order step-by-step, eventually allowing the Visigoths to settle within the empire in southwest Gaul. He also committed to retaking control of Iberia, from the Rhine-crossing groups. When Constantius died in 421, having been co-emperor himself for one year, Honorius was the only emperor in the West. However, Honorius died in 423 without an heir. After this, the Western Roman empire steadily lost control of its provinces.