Noun
the king of Castile and Aragon who ruled jointly with his wife Isabella; his marriage to Isabella I in 1469 marked the beginning of the modern state of Spain and their capture of Granada from the Moors in 1492 united Spain as one country; they instituted the Spanish Inquisition in 1478 and supported the expedition of Christopher Columbus in 1492 (1452-1516)
Source: WordNetIt reads: citation Borgia was an old enemy of Ferdinand of Aragon, and he was fighting the count who paved the way for Ferdinand's 1512 Castilian invasion against John III and Catherine of Navarre. Source: Internet