Christopher Columbus was an Italian explorer and colonizer who completed four voyages across the Atlantic Ocean that opened the New World for conquest and permanent European colonization of the Americas. Columbus had embarked with intent to find and develop a westward route to the Far East, but instead discovered a route to the Americas, which were then unknown to the Old World. Columbus's voyages were the first European expeditions to the Caribbean, Central America, and South America. His Spanish-based expeditions and governance of the colonies he founded were sponsored by Queen Isabella I of Castile and King Ferdinand II of Aragon, the Catholic Monarchs of the budding Spanish Empire. Columbus never clearly renounced his belief that he had reached the Far East.