Aspects of this topic are discussed in the following places at Britannica.
...maintained control of the eastern region but had to cope with raids by the Bretons, who had established heavily populated settlements in the western part of the peninsula. To the southwest the Gascons, a highland people from the Pyrenees, had been driven northward by the Visigoths in 578 and settled in Novempopulana; in spite of several Frankish expeditions, this area was not subdued. In...
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