King Ferdinand, also known as Ferdinand II of Aragon, was a pivotal figure in the unification of Spain during the late 15th century. He and his wife, Queen Isabella I, are best known for their sponsorship of Christopher Columbus's 1492 voyage, which led to the discovery of the Americas. Ferdinand's reign marked the beginning of Spain's rise as a global power. His efforts in consolidating the Spanish kingdoms and enforcing religious unity through the Spanish Inquisition significantly shaped the nation's future, leaving a lasting legacy in both Spanish and world history.