On the eastern border, changes occurred with the departure of the West Germanic Lombard tribes from the Pannonian basin to northern Italy in 568 and the succession of the Avars, as well as with the settlement of West Slavic Czechs on the adjacent territory beyond the Bohemian Forest at about the same time. At around 743, the Bavarian duke Odilo vassalised the Slavic princes of Carantania (roughly corresponding with the later March of Carinthia), who had asked him for protection against the invading Avars. The residence of the largely independent Agilolfing dukes was then Regensburg, the former Roman Castra Regina, on the Danube river.