History:
In 1824 the French Prince Julius of Montleart and his wife Maria Christine bought Schloss Wilhelminenberg Palace and the surrounding lands. In 1838 he had the leisure palace built bigger by adding two more wings in the neo-Classical style. The Prince of Montleart died in 1865.

His son Moritz acquired the property after considerable legal battles and gave it to his wife Wilhelmine. Thus, he wanted the entire area be called "Wilhelminenberg". By this time, the hill was registered as "Gallitzinberg".

Prince Moritz of Montleart died in 1887 and was buried in a neo-Gothic chapel near the palace. His widow followed the local tradition and was active as a philanthropist - she is still known in the area as the "Angel of Mount Wilhelminenberg". She died in 1895.