The earliest named nobleman associated with the areas around the castle is the eldest son of Wulfing von Prosset (also Wulfingus de Brozzat), Gottschalk von Prosset (Gotscalcus Schirling), who was a vassal of the Styrian Margrave Otakar III.

The strategic importance of Landsee stems from it location just a few hundred meters east of the border between the Austrian territories of the Holy Roman Empire and the Kingdom of Hungary.

The Urkundenbuch des Herzogthums Steiermark[5] (collection of old documentary sources surrounding the Duchy of Styria) mentions an Erchenger von Landesehre in 1173, whose family also owned the Hohenwang Castle near Langenwang.

Erasmus von Teufel, whose epitaph is located in the chapel of Winzendorf, was an imperial "Rat Spann und Hauptmann zu Ödenburg" and "supreme cavalry commander in Hungary".

[9] Erasmus was taken prisoner by Turks in Transylvania in 1552, where he was negotiating as the emperor's envoy, and was executed by Janissaries.

His successor, Prince Anton had to implement strict austerity measures, due to the extravagant lifestyle of his predecessor, which left him with 3.8 million guilders in debt.

The structure (called Schloss at the time, see the historical map) was not rebuilt and abandoned in favor of Forchtenstein Castle and the dominion of Lackenbach.

[citation needed] The structure is approximately 300 × 200 m in size and clearly shows that the castle consisted of four rings of fortifications, the first of which was separated by two ditches.

From there a staircase through the sixth gate reaches the central building, where the location of the kitchen can still be identified.

Similar to Forchtenstein Castle, the strongest fortifications (thickest walls of the keep) face west, towards Austria, while the living quarters are located in the east, secured by steep drops.

[12] In the outer courtyard, concerts, theater evenings, and other entertainment events take place during the summer months.

The castle was used as a location for Disney's The Three Musketeers (1993 film) starring Kiefer Sutherland, Charlie Sheen, Chris O'Donnell, and Oliver Platt.