Maria Beatrice d'Este ( Maria Beatrice Ricciarda ; 7 April 1750 - 14 November 1829 ) was heiress of Modena and Reggio as well as the sovereign of Massa and Carrara from 1790 until 1797 and from 1816 until her death in 1829 .
Maria Beatrice d'Este ( Maria Beatrice Ricciarda ; 7 April 1750 - 14 November 1829 ) was heiress of the two Duchies of Modena and Reggio .