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Visigothic expansion into Spain was slow, starting with the small army led by Ataulf in 415.The main body of Visigoths arrived in Spain during the reign of Alaric II in the late fifth century, possibly encouraged by increased attacks by the Franks on Visigothic lands in France.After unsuccessfully attempting to conquer north Africa, King Walia surrendered to Constantius, the Roman commander-in-chief of the West, in early 416 in return for urgently needed food supplies.He also agreed to provide military help against the Vandals and Suevi in Spain.
Olympiodorus Thebus records that Ataulf named as his successor fratri suo, who was displaced by Sari frater, Singerichus, who was killed after seven days [Valia], son of --- (-Gaul 418).
The primary source which records Theoderics marriage has not been identified.
His wifes parentage and marriage are indicated by Wolfram who says that Walia was succeeded by Theoderid, son or rather son-in-law of Alaric I, the basis for the latter being Alarics son is unknown.
They separated into two tribal groups, the Visigoths to the west and the Ostrogoths to the east.
Under pressure from the Huns, they sought permission from the Roman Emperor Valens to move into the Roman empire to the south of the river Danube in 376.
The Visigoths were expelled from France in 531, and established their new capital at Barcelona.