Alfonso XII of Spain
On 14 February 1901 in Madrid, Carlos married Mercedes, Princess of Asturias, elder daughter of the late King Alfonso XII of Spain and of his wife Archduchess Maria Christina of Austria. Mercedes was the elder sister and heir presumptive to King Alfonso XIII of Spain, an unmarried teenager. A week before the wedding, on 7 February, Carlos was given the title of "Infante of Spain".