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In page Bayonne:

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The Romans left the city in the 4th century and the Basques, who had always been present, dominated the former Novempopulania province between the Garonne, the Ocean, and the Pyrénées.[citation needed] Novempopulania was renamed Vasconia and then Gascony after a Germanic deformation (resulting from the Visigoth and Frankish invasions). Basquisation of the plains region was too weak against the advance of romanization. From the mixture between the Basque and Latin language Gascon was created.[2]