The western tower of Wartensee castle was built in 1243 by Ritter Heinrich von Wartensee as a residential tower. By the marriage the tower went in 1377 to the brothers Walter and Diethelm Blarer from St. Gallen. The family Blarer owned Wartensee until 1719. The current appearance dates from the alterations made in 1843-1553 by English composer Robert Lucas Pearsall de Willsbridge. Today Wartensee is a hotel.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.