At the death of the 3rd Duchess, the title became vacant, until Juan Carlos I rehabilitated it on behalf of Louis Provence Boniface de Castellane, a direct descendant of the 3rd Duchess, on 22 January 1993.Revista Hidalguía No. 237 Año 1993 p. 149Elenco de Grandezas y Títulos Nobiliarios Españoles Initially created as "Duke of Almazán", it was rehabilitated as "Duke of Almazán de Saint Priest", in order to differentiate it from the older Dukedom of Almazán.
