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Francisco de Paula de Borbn y Castellv was a younger son of the controversial Infante Enrique, Duke of Seville, grandson of Charles IV of Spain and younger brother of Francis, Duke of Cdiz, King consort of Isabella II of Spain. Despite his family ties, Francisco was never entitled Infante of Spain due to the unequal marriage of his parents, which did not receive approval from Queen Isabella II.

Francisco de Paula was born at Toulouse, France, the third child of Infante Enrique, Duke of Seville and his wife, Elena Mara de Castellv y Shelly , daughter of Antonio de Padua de Castellv y Fernndez de Crdoba, Count of Castell, and Margarita Shelly. His mother was of Valencian and Irish ancestry. His parents marriage was not approved by Queen Isabella II, so they were married in secret in Rome. Once they returned to Spain, the couple were exiled to Bayonne, and later they settled in Toulouse.

Source: Wikipedia