 In 1810, Auguste-Henri-Victor Grandjean de Montigny rebuilt the state rooms of the palace,
and after Kassel's primary palace had burned in 1811, Jérôme himself moved into Bellevue Palace.Jacob Grimm, the private librarian of King Jérôme and state auditor, was a frequent visitor.After Jérôme was expelled in 1813 William IX, later Elector William I of Hesse (1743–1821), returned.