Northern Africa 409: Vandalic invasion of Spain
Soon after seizing power in Hispaniae (spring 409), Gerontius encouraged the Vandals, Alans, and Suebi to revolt against Constantine III and join him. Cutting a swathe of destruction across Gaul, the Vandals and their allies advanced to the Pyrenees, which they crossed into Spain on 28 September and/or 12 October.
409 Revolt of the Barbarians▲
In mid-summer 409, encouraged by the rebel general Gerontius in Hispaniae, the Vandals, Alans, and Suebi revolted against Constantine III in Belgica and proceeded to march south and west across Gaul towards the Pyrenees. Devastating the provinces of Aquitania, Narbonensis, and Novempopuli as they went, the barbarians reached Tolosa (Toulouse) in September, by which point, according to a Roman poet, “All Gaul was filled with the smoke of a single funeral pyre.” Inspired to resist by the bishop Exuperius, Tolosa itself held out for some time but eventually succumbed to the invaders.
409–411 Franco-Burgundian expansion▲
In the summer of 409, taking advantage of the chaos caused by the revolt of the Vandals, Alans, and Suebi against Constantine III, the Franks and Burgundians crossed the Rhine and invaded Gaul. Their raids would continue until the fall of Constantine in 411, during which time they would gain control of large amounts of territory on the formerly Roman left bank of the Rhine.
28 Sep–12 Oct 409 Vandalic invasion of Spain▲
After plundering Gaul, the Vandals, Alans, and Suebi entered the Diocese of Hispaniae via the Pyrenees in either late September or early October 409 (or both; the destruction in southern Gaul suggests that the invaders traveled in at least two separate groups). The Honoriaci—a unit recently charged with defending the mountain passes—allowed them through without offering significant resistance, probably on orders from Gerontius, the rebel general in control of Spain.