About George Maximilianovich, 6th Duke of Leuchtenberg
Prince George Maximilianovich Romanowsky, 6th Duke of Leuchtenberg, also known as Prince Georgii Romanovsky or Georges de Beauharnais, was the youngest son of Maximilian de Beauharnais, 3rd Duke of Leuchtenberg, and Grand Duchess Maria Nikolaevna of Russia. Their marriage was considered "tempestuous and stormy," with George reportedly "insult and outrag her from the very first day of their marriage". Anastasia later remarried to Grand Duke Nicholas Nikolaevich of Russia, a grandson of Nicholas I of Russia (and on his mother's side a nephew of George's first wife Theresa). In 1901, through either the deaths or morganatic marriages of his elder brothers, George became the head of the Russian branch of the House of Beauharnais.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.