sentences:  The House of Habsburg provided Styria with dukes of their lineage from that point on.The duchy was, however, separated from Austria by the 1379 Treaty of Neuberg, after which Styria, Carinthia, and Carniola formed the Inner Austrian territory ruled by the descendants of Leopold III of Habsburg of the Leopoldian line, who took their residence at Graz.In 1456 they could significantly enlarge the Styrian territory by acquisition and re-acquisition of the comital Celje estates in Lower Styria.