Duke of Dato

The Dukedom of Dato is a Spanish dukedom created on 21 March 1921. King Alfonso XIII of Spain created the Dukedom for María de Barrenechea whose husband, Eduardo Dato e Iradier, Prime Minister of Spain, had been assassinated on 8 March 1921.

Succession
Like all other Spanish noble titles, the Dukedom of Dato descended according to male-preference cognatic primogeniture, meaning that females could inherit the Dukedom if they had no brothers (or if their brothers had no issue). That changed in 2006 and the eldest child (regardless of sex) succeeds to the Dukedom.

History
Upon the death of the 1st Duchess, the title was inherited by her eldest daughter, Isabel Dato. The 2nd Duchess died unmarried and childless, so the Dukedom devolved upon her younger sister, María del Carmen Dato. The 3rd Duchess was succeeded by her son, Eduardo Espinosa de los Monteros y Dato, who was in turn succeeded by his own son, Eduardo Espinosa de los Monteros y Español.