The Heiligenberg is an estate near the Dutch town of Leusden.
The estate is located on a 12-metre (39 ft) high hill, the "Heiligenberg" (Holy Mountain), which dates from the last ice age, about 10,000 years ago.
On this hill, then known as Hohorst, bishop Ansfridus of Utrecht founded a small abbey around the year 1000.
After the Reformation, the States of Utrecht took over ownership and management and appointed a steward.
[2] In 1637, the house became an estate and at the later 17th century it belonged to Jacob de Petersen.