▁the ▁continent . ▁In ▁ 1 7 7 9 , ▁Frederick ▁II ▁opened ▁a ▁public ▁museum ▁of ▁natural ▁history ▁and ▁classical ▁art , ▁the ▁Fr ider ician um , ▁but ▁kept ▁the ▁royal ▁painting ▁collection ▁in ▁Belle vue ▁palace . ▁In ▁ 1 7 9 0 ▁Simon ▁Louis ▁du ▁Ry ▁renov ated ▁the ▁building ▁for ▁William ▁IX ▁( 1 7 4 3 – 1 8 2 1 ). ▁ ▁During ▁the ▁Napole onic ▁era ▁the ▁palace ▁became ▁the ▁property ▁of ▁J ér ôme ▁Bon ap arte ▁( 1 7 8 4 – 1 8 6 0 ), ▁King ▁of ▁West phal ia ▁from ▁ 1 8 0 7 ▁to ▁ 1 8 1 3 . ▁It ▁first ▁hous ed ▁his ▁foreign ▁minister , ▁ ▁Pierre ▁Alexandre ▁Le ▁Cam us . ▁In ▁ 1 8 1 0 , ▁August e - Hen ri - V ict or ▁Grand je an ▁de ▁Mont igny ▁re built ▁the ▁state ▁rooms ▁of ▁the ▁palace , ▁and ▁after ▁K ass el ' s ▁primary ▁palace ▁had ▁burn ed ▁in ▁ 1 8 1 1 , ▁J ér ôme ▁himself ▁moved ▁into ▁Belle vue ▁Palace . ▁Jacob ▁Gr imm , ▁the ▁private ▁li br arian ▁of ▁King ▁J ér ôme ▁and ▁state ▁aud itor , ▁was ▁a ▁frequent ▁visitor . ▁After ▁J ér ôme ▁was ▁exp elled ▁in ▁ 1 8 1 3 ▁William ▁IX , ▁later ▁Elect or ▁William ▁I ▁of ▁H esse ▁( 1 7 4 3 – 1 8 2 1 ), ▁returned . ▁William ▁II