Infante Carlos María Isidro of Spain
![Portrait by [[Vicente López Portaña]], {{circa|1823}}](https://upload.wikimedia.org/wikipedia/commons/f/f4/Carlos_Mar%C3%ADa_Isidro_de_Borb%C3%B3n%2C_por_Vicente_L%C3%B3pez.jpg)
''Don'' Carlos María Isidro Benito de Borbón y Borbón-Parma (29 March 17886 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.
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