Isabella I, also known as Isabella the Catholic, was a queen of Castile and León in the late 15th century. Some synonyms for Isabella I include Isabella of Castile, Isabella the Catholic, and Queen Isabella. Isabella is known for her role in the Spanish Inquisition and for funding Christopher Columbus' voyage to the New World. She was a devout Catholic and played a pivotal role in the unification of Spain. Isabella's legacy continues to be studied and debated among historians and scholars, but she remains a fascinating figure in Spanish and European history.