He became Ferdinand V of Castile when he married Isabella I of Castile. They united their two kingdoms, running them as one country though they remained officially separate. He was also the king of Sicily (as Ferdinand II) from 1468 to 1516 and Naples (as Ferdinand III) from 1504 to 1516.
Their children included Joanna of Castile and Catherine of Aragon. Because of the power of their joint kingdoms, their daughters married with several European dynasties, setting the bases for the huge heritage of her grandson Charles V.
In November 1511 Ferdinand and Henry VIII of England signed the Treaty of Westminster, pledging mutual aid between the two against France. Earlier that year, Ferdinand had conquered the southern half of the Kingdom of Navarre and annexed it to Spain. Since he was a widower by then, he married Germana of Foix.
After Isabella left her kingdom to her daughter Joanna, Ferdinand served as her regent during her insanity. Though rebuffed by the Castilian nobility and replaced with Joanna's husband Philip I of Castile, he resumed his regency after Philip's death. Joanna's son, the Holy Roman Emperor Charles V, succeeded her on the throne of Castile; and he also succeeded Ferdinand on the Aragonese throne when Ferdinand died in 1516. Thereafter the thrones were united; see List of Spanish monarchs.
Ferdinand VII, king of Spain (1784-1833), the eldest son of Charles IV, king of Spain, and of his wife Maria Louisa of Parma, was born at the palace of San Ildefonso near Balsam in the Somosierra hills, on October 14 1784.
Then he spent years as the prisoner of Napoleon, and returned in 1814 to find that while Spain was fighting for independence in his name a new world had been born of foreign invasion and domestic revolution.
When at last the inevitable revolt came in 1820 he grovelled to the insurgents as he had done to his parents, descending to the meanest submissions while fear was on him, then intriguing and, when detected, grovelling again.
Ferdinand VII (October 14, 1784 - September 29, 1833) was King of Spain from 1813 to 1833.
Ferdinand soon found that while Spain was fighting for independence in his name and while in his name juntas had governed in Spanish America, a new world had been born of foreign invasion and domestic revolution.
Ferdinand had restored the Jesuits upon his return; now the Society had become identified with repression and absolutism among the liberals, who attacked them: twenty-five Jesuits were slain in Madrid in 1822.