 At that time Arelate, an important city in Narbonensis near the mouth of the Rhone, was under siege from the Visigoths, led by their king Theodoric I. Aetius defeated Theodoric, lifted the siege of Arelate, and drove the Visigoths back to their holdings in Aquitania.In 428 he fought the Salian Franks, defeating their king Chlodio and recovering some territory they had occupied along the Rhine.In 429 he was elevated to the rank of "magister militum"; this was probably the "junior" of the two offices of "comes et magister utriusque militiae", as the "senior" is known to have been the patrician Flavius Constantinus Felix, the most influential man in those years, and a supporter of Galla Placidia.