Duke of Tetuan is a hereditary title in the Spanish nobility

Spanish nobility

Spanish nobles are persons who possess the legal status of hereditary nobility according to the laws and traditions of the Spanish monarchy. A system of titles and honours of Spain and of the former kingdoms that constitute it comprise the Spanish nobility...

. As all Spanish dukedoms, it is accompanied by the Grandeeship of Spain 1st Class. The dukedom of Tetuan was granted by Queen Isabella II

Isabella II of Spain

Isabella II was the only female monarch of Spain in modern times. She came to the throne as an infant, but her succession was disputed by the Carlists, who refused to recognise a female sovereign, leading to the Carlist Wars. After a troubled reign, she was deposed in the Glorious Revolution of...

 to General Leopoldo O'Donnell y Joris

Leopoldo O'Donnell, 1st Duke of Tetuan

Don Leopoldo O'Donnell y Jorris, 1st Duke of Tetuan, 1st Count of Lucena, 1st Viscount of Aliaga, Grandee of Spain, , was a Spanish general and statesman...

, 1st Count of Lucena. It was conferred upon him in 27 March 1860, shortly after the Battle of Tetuan in the Spanish-Moroccan War

Spanish-Moroccan War (1859)

The Hispano-Moroccan War, also known as the Spanish–Moroccan War, the First Moroccan War, the Tetuán War, or, in Spain, as the African War , was fought from Spain's declaration of war on Morocco on 22 October 1859 until the Treaty of Wad-Ras on 26 April 1860...

, as a victory title

Victory title

A victory title is an honorific title adopted by a successful military commander to commemorate his defeat of an enemy nation. This practice was first used by Ancient Rome and is still most commonly associated with the Romans, but it has also been adopted as a practice by many modern empires,...

.

It has been held since its creation by members of the O'Donnell family

O'Donnell dynasty

O'Donnell , which is derived from the forename Domhnaill were an ancient and powerful Irish family, kings, princes, and lords of Tír Chonaill in early times, and the chief allies and sometimes...

, as the 5th Duchess, Blanca O'Donnell, died without issue of her marriage to Guillermo Pelizaeus. If they had had children, the dukedom would have gone out of the family.

Dukes of Tetuan (1860-)

• Leopoldo O'Donnell, 1st Duke of Tetuan
  Leopoldo O'Donnell, 1st Duke of Tetuan
  Don Leopoldo O'Donnell y Jorris, 1st Duke of Tetuan, 1st Count of Lucena, 1st Viscount of Aliaga, Grandee of Spain, , was a Spanish general and statesman...
  
   (1809–1867)
• Carlos O'Donnell, 2nd Duke of Tetuan
  Carlos O'Donnell, 2nd Duke of Tetuan
  Don Carlos Manuel O'Donnell y Álvarez de Abreu, 2nd Duke of Tetuan Grandee of Spain, 9th Marquis of Altamira and 2nd Count of Lucena was a Spanish noble and politician who served four times as Minister of State, the name which then received the Spanish Foreign Minister.The Duke was son of Carlos...
  
   (1834–1903), son of the 1st duke's eldest brother
• Juan O'Donnell, 3rd Duke of Tetuan (1864–1928), eldest son of the 2nd duke
• Juan O'Donnell, 4th Duke of Tetuan (1897–1934), eldest son of the 3rd duke
• Blanca O'Donnell, 5th Duchess of Tetuan (1898–1952), elder daughter of the 3rd duke
• Leopoldo O'Donnell, 6th Duke of Tetuan (?–2004), eldest son of the 2nd duke's third son
• Hugo O'Donnell, 7th Duke of Tetuan (b. 1948), eldest son of the 6th duke

The heir apparent

Heir apparent

An heir apparent or heiress apparent is a person who is first in line of succession and cannot be displaced from inheriting, except by a change in the rules of succession....

 is Carlos O'Donnell, Marquis of Altamira (b. 1974).