Yelagin Palace (Елагин дворец; also Yelaginsky or Yelaginoostrovsky Dvorets) completed in 1822 is a palace in Saint Petersburg which is situated on Yelagin Island in the Neva River and served as a royal summer palace during the reign of Tsar Alexander I. Constructed on the site of an earlier mansion built during the rule of Catherine the Great, the villa was designed for Alexander's mother, Maria Fyodorovna, by the architect Carlo Rossi.