By the year 602, the duchy of Vasconia, under Frankish overlordship, was consolidated in the areas around the Garonne river but it may have extended up to Cantabria, under Frankish domain at the time of and before the creation of the Duchy. In the years 610 and 612 respectively, the Gothic kings Gundemar and Sisebut launched attacks against the Basques. After a Basque attack in the Ebro valley in the year 621, Swinthila defeated them and founded the fortress of Olite.