3621036 Tsar Alexander I of Russia visiting the tomb of Frederick the Great at Potsdam with King Frederick William III and Queen Louise of Prussia and swearing his unswerving friendship, 5 November 1805 (colour litho) by Rochling, Carl (1855-1920); Private Collection; (add.info.: Tsar Alexander I of Russia visiting the tomb of Frederick the Great at Potsdam with King Frederick William III and Queen Louise of Prussia and swearing his unswerving friendship, 5 November 1805. Illustration from Die Konigin Luise (Paul Kittel, Berlin, 1896).); by Look and Learn.