Don Carlos Fernando Martínez de Irujo y McKean, 2nd Marquess of Casa Irujo, jure uxoris Duke of Sotomayor, Grandee of Spain (14 December 1802 – 26 December 1855) was a Spanish noble and politician who served as Prime Minister of Spain.
Additionally, he is a male line ancestor of the reigning duke of Alba.
[1] His mother was the daughter of the Pennsylvania Governor and signer of the United States Declaration of Independence Thomas McKean and Pennsylvania First Lady Sarah Armitage McKean.
Don Carlos became a Grandee of Spain in 1844 through his marriage to Gabriela del Alcázar, 7th Duchess of Sotomayor through which he gained the courtesy title, Duke of Sotomayor.
Together, they were the parents of two children: Martínez de Irujo died on 26 December 1855 in Madrid.