Rosersberg Palace (Swedish: Rosersbergs slott) is one of the Royal Palaces of Sweden. Situated on the shores of Lake Mälaren, on the outskirts of Stockholm, it was built in the 1630s by the Oxenstierna family and became a royal palace in 1762, when the state gave it to Duke Karl (later Karl XIII), the younger brother of Gustav III of Sweden. It is the current private residence of The Duke and Duchess of Västerbotten and their family, since their wedding day on 19 June 1999.