Gustav Vasa and his sons Erik and Johan erected a lavish renaissance palace with a round inner courtyard.
It was built as a hunting palace for then current queen Ulrika Eleonora using drawings by Carl Hårleman.
The palace was extended on both short ends by drawings of Carl Fredrik Adelcrantz, together with a bell tower.
As more violent criminals were admitted to Svartsjö Palace, a special closed section was created with 337 cells built with steel walls.
[1][2] After years of neglect the palace was restored from 1994 to 2003 by the state, to a cost of 36 million SEK.