Political intrigue preceded Wallia's ascension to power, for his Visigothic predecessor Athaulf—who married Galla Placidia in 414—was murdered by his followers who believed him to be a puppet to Roman interests.
[1] Athaulf's successor, Sigeric, ignored the Visigothic rights of procedure to military leadership and seemed to likewise acquiesce to the Romans; such perceptions among his people quickly led to his death in turn just seven-days after assuming power.
[3] Like his predecessor Alaric, Wallia attempted to take his Gothic forces to northern Africa but ultimately "foundered in the Sea of Gibraltar", a failure that precipitated his suing for peace.
[6][b] Whatever advantages won by Wallia in acquiring food for his forces via treaty with Rome, it was Constantius who exploited the situation by securing the return of emperor's sister, a move historian Michael Kulikowski termed, a route "into the imperial family".
"[8][c] Nonetheless, Wallia's Gothic federates were "assigned" the Garonne valley from "Toulouse to Bordeaux" and the coastal strip along the Atlantic from Les Landes at the foot of the Pyrenees mountains "to the Loire in the north".