Kahlenberg (German: bald mountain) was uninhabited until the 18th century. Originally, the mountain was called Sauberg (sow mountain) or Schweinsberg (pig mountain), after the numerous wild pigs that lived in the pristine oak forests. In 1628, Ferdinand II acquired the mountain from the Klosterneuburg monastery and called it Josephsberg (Joseph's Mountain). Only after Emperor Leopold I renamed the original Kahlenberg (the neighbouring mountain) to Leopoldsberg was the name Kahlenberg given to the Josephsberg.