In 587 the Franks launched a second attack on the Basques .
Basques were defeated on the plains of Aquitaine , implying that Basque settlement or conquest had begun north of the Pyrenees .
In 587 the Franks launched a second attack on the Basques , but they were defeated on the plains of Aquitaine , implying that Basque settlement or conquest had begun north of the Pyrenees .