Duke of Sanlúcar la Mayor

Duke of Sanlúcar la Mayor (Spanish: Duque de Sanlúcar la Mayor) is a hereditary title in the Peerage of Spain, accompanied by the dignity of Grandee and granted in 1625 by Philip IV to Gaspar de Guzmán, 3rd Count of Olivares and royal favourite to the king.^[2][3]

Dukedom of Sanlúcar la Mayor
Creation date	25 January 1625
Created by	Philip IV
Peerage	Peerage of Spain
First holder	Gaspar de Guzmán y Pimentel, 1st Duke of Sanlúcar la Mayor
Present holder	María Cristina Ruiz de Arana y Marone-Cinzano, 18th Duchess of Sanlúcar la Mayor[1]

Since the title was granted to the Count of Olivares, the first holder became popularly known as the "Count-Duke of Olivares", by conjunction of the two titles. However, and by Royal Decree in 1882, the Countship of Olivares became officially known as the Countship-Dukedom of Olivares (condado-ducado de Olivares). The Dukedom of Sanlúcar la Mayor remains with the original denomination, and makes reference to the town of Sanlúcar la Mayor in the Province of Seville.^[4]