The original home territories of the Habsburgs, the Aargau with Habsburg Castle and much of the other original possessions south of the High Rhine and Lake Constance were already lost in the 14th century to the expanding Swiss Confederacy after the battles of Morgarten (1315) and Sempach (1386). These territories were never considered part of Further Austria – except for the Fricktal region around Rheinfelden and Laufenburg, which remained a Habsburg possession until 1797.