Svartsjö Palace (Swedish: Svartsjö slott, "Black Lake Castle") is a palace situated in Svartsjö on the island of Färingsö in lake Mälaren. It is a 30 minute car ride from Stockholm, the capital of Sweden. The location of this palace has housed several royal buildings. During medieval times there was a stone house where prominent Swedish royalty lived. Gustav Vasa and his sons Erik and Johan erected a lavish renaissance palace with a round inner courtyard. It was at least partly designed by Willem Boy and completed in 1580 but burnt down in 1687. The remaining building material was shipped to Stockholm to be used in the build of the castle Tre kronor. The stone foundation was left and is visible today.