Duke of Leuchtenberg

[2] The subsidiary title, also in the Bavarian peerage, was Prince of Eichstätt, but its attached territory was sold off by the 4th Duke to the King of Bavaria in 1855.

[2][5] On 14 July 1839, Emperor Nicholas I of Russia granted the Russian and Finnish style Imperial Highness, alongside the subsidiary title Prince Romanovsky, to the 3rd Duke, Maximilian, who had just married his daughter, Grand Duchess Maria Nikolaevna.

This creation once again confirmed the elevation of the style from Serene to Imperial Highness, and was to be carried by all male line descendants of Nicholas born of marriages of the corresponding rank, of the incumbent Duke from 1852 to 1891.

The title is claimed by Nicolas de Leuchtenberg (born 1933),[8] senior heir of the 4th Duke by a morganatic marriage, whose grandfather Nicolas Nikolaievitch (1868–1928) was titled Duke of Leuchtenberg in 1890 by edict of Tsar Alexander III of Russia, with the style Highness.

[7] Note: according to the present-day republican German law, the subsequent list is only an original research.