House of Este
The elder branch of the House of Este included the dukes of Brunswick and Lüneburg (1208–1918). It also produced Britain's Hanoverian monarchs and one Emperor of Russia (Ivan VI). The younger branch of the House of Este included the Sovereign Dukes of Ferrara (1240–1597), and Modena and Reggio (1288–1796). Following the marriage of Maria Beatrice d'Este to Archduke Ferdinand of Austria (1771) the House of Austria-Este was formed.