Suburates
The Suburates (also named "Sibulates") were a pre-Roman tribe of the Aquitani, settled in what today is the historical territory of Soule (in Basque "Xiberoa"), in the Northern Basque Country. From their name come the French and Occitan name for the region, "Soule", and the Basque names "Xiberoa" and "Zuberoa". The Suburates spoke a form or dialect of the Aquitanian language, a precursor of the Basque language. The Siburates mentioned by Julius Caesar, with the name of "Sibusates" in his "Commentarii de Bello Gallico", which was his firsthand account of the Gallic Wars, where he narrates the expedition  of Publius Licinius Crassus to Aquitaine, and also by Pliny the Elder as "Sybillates". The name "Subola", precedent of present-day Soule and Zuberoa, is attested for the first time in 635, when a column of a Franco-Burgundian expedition led by Duke Arnebert against the Basques was defeated by them.