Pragmatic Sanction of 1830 in the context of "Spanish succession issue of 1789"

Isabella II (Spanish: Isabel II, María Isabel Luisa de Borbón y Borbón-Dos Sicilias; 10 October 1830 – 9 April 1904) was Queen of Spain from 1833 until her deposition in 1868. She is the only queen regnant in the history of unified Spain.

Isabella was the elder daughter of King Ferdinand VII and Queen Maria Christina. Shortly before Isabella's birth, her father issued the Pragmatic Sanction to revert the Salic Law and ensure the succession of his firstborn daughter, due to his lack of a son. She came to the throne a month before her third birthday, but her succession was disputed by her uncle, Infante Carlos (founder of the Carlist movement), whose refusal to recognize a female sovereign led to the Carlist Wars. Under the regency of her mother, Spain transitioned from an absolute monarchy to a constitutional monarchy, adopting the Royal Statute of 1834 and Constitution of 1837.

The Carlist Wars (Spanish: guerras carlistas, Basque: karlistadak) were a series of civil wars that took place in Spain during the 19th century. The contenders fought over claims to the throne, although some political differences also existed. Several times during the period from 1833 to 1876 the Carlists—followers of Don Carlos (1788–1855), an infante, and of his descendants—rallied to the cry of "God, Country, and King" and fought for the cause of Spanish tradition (Legitimism and Catholicism) against liberalism, and later the republicanism, of the Spanish governments of the day. The Carlist Wars had a strong regional component (Basque region, Catalonia, etc.), given that the new order called into question region-specific law arrangements and customs kept for centuries.

When King Ferdinand VII of Spain died in 1833, his widow, Queen Maria Cristina, became regent on behalf of their two-year-old daughter Queen Isabella II. The country splintered into two factions known as the Cristinos (or Isabelinos) and the Carlists. The Cristinos supported Queen Maria Cristina and her government, and were the party of the Liberals. The Carlists advocated for Infante Carlos of Spain, Count of Molina, a pretender to the throne and brother of the deceased Ferdinand VII. Carlos denied the validity of the Pragmatic Sanction of 1830 that abolished the semi Salic Law (he was born before 1830). The Carlists wanted a return to autocratic monarchy.