By the acquisition of various lordships, they established several lines in Upper Austria. The lines of Linz and Drosendorf went extinct in 1400, that of Enns in 1483 and that of Graz in 1363. They frequently held the office of Hauptmann (governor) in Lower Austria and Styria.[1] During the feudal wars at the end of the 13th century they expanded their possessions in some parts of the Croatian-Hungarian Kingdom. Ulrich I. von Walsee[2][3][4] became lord of Međimurje in northern Croatia.
In 1395, they acquired Duino Castle after the extinction of the local lords. They also acquired Fiume and the coast in 1400. In 1465 and 1471, the Emperor Frederick III was confirmed as heir to Fiume.[5][6]
Notes
^Wallsee, Walchsee, Walse, Walsse, Wallssee, Waldze, Waldsee; Italian Valsa.
^August Dimitz, History of Carniola from Ancient Times to the Year 1813 with Special Consideration of Cultural Development, Volume I: From Primeval Times to the Death of Emperor Frederick III (1493) (Slovenian Genealogy Society International, 2013 [1874]), pp. 179, 226.
^Josip Banić, 'The Mystery of Merania: A New Solution to Old Problems (Holy Roman Empire and the Kingdom of Croatia-Dalmatia during the Investiture Controversy)", Historical Review, Ljubljana75.162 (2020), pp. 296–327.
Further reading
Doblinger, Max (1906). Die Herren von Walsee. Ein Beitrag zur österreichischen Adelsgeschichte. Vienna.{{cite book}}: CS1 maint: location missing publisher (link)
Köbler, Gerhard (2007). Historisches Lexikon der Deutschen Länder: die deutschen Territorien vom Mittelalter bis zur Gegenwart (7th rev. ed.). Munich: C. H. Beck.