Ferdinand II King of Aragon and Regent of Castile, incorporated the American territories into the Kingdom of Castile and then withdrew the authority granted to governor Christopher Columbus and the first conquistadors. He established direct royal control with the Council of the Indies, the most important administrative organ of the Spanish Empire, both in the Americas and in Asia. After unifying Castile, Ferdinand introduced to Castile many laws, regulations and institutions such as the Inquisition, that were typical in Aragon. These laws were later used in the new lands.