Duke of Frías is a hereditary title in the peerage of Spain accompanied by the dignity of Grandee, created in 1492 by King Ferdinand II of Aragon and conferred to his son-in-law Don Bernardino Fernández de Velasco, 2nd Count of Haro, Constable of Castile, and Viceroy of Granada. It is one of the most important titles in Spain and one of the first titles to receive the honor of Grandee of Spain by Emperor Charles V in 1520.

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