Ferdinand of Aragon, also known as King Ferdinand II of Aragon, was a prominent figure in European history. Synonyms for Ferdinand of Aragon include "Fernando el Católico" (Ferdinand the Catholic), "Ferdinand V of Castile," and "Ferdinand the Just." As the husband of Queen Isabella I of Castile, Ferdinand played a significant role in the unification of Spain and the spread of Christianity throughout the Americas. He is also known for his involvement in the Spanish Inquisition and his support of Christopher Columbus's expeditions. Ferdinand's legacy continues to impact Spain and the world today.