Who married Maria Teresa, Princess of Beira?

Infanta Maria Teresa of Braganza (Portuguese pronunciation: [mɐˈɾiɐ tɨˈɾezɐ] or [ˈtɾezɐ]; 29 April 1793 – 17 January 1874) was the firstborn child of John VI of Portugal and Carlota Joaquina of Spain. From 1828 to 1834, she was heiress presumptive to the Portuguese throne.

Don Pedro Carlos (Pedro Carlos Antonio Rafael José Javier Francisco Juan Nepomuceno Tomás de Villanueva Marcos Marcelino Vicente Ferrer Raimundo; 18 June 1786 – 4 July 1812) was an Infante of Spain and Portugal.

Don Carlos María Isidro Benito de Borbón y Borbón-Parma (29 March 1788 – 10 March 1855) was an Infante of Spain and the second surviving son of King Charles IV of Spain and his wife, Maria Luisa of Parma. He claimed the throne of Spain after the death of his older brother King Ferdinand VII in 1833. His claim was contested by liberal forces loyal to the dead king's infant daughter, resulting in the First Carlist War (1833–1840). Don Carlos had support from the Basque provinces and much of Catalonia, but lost the war. His heirs continued the traditionalist cause, fought two more Carlist wars and were active into the mid-20th century, but never gained the throne.