Isabella I was Queen of Castile and Leon and she was married to Ferdinand II of Aragon. Even though their kingdoms remained somewhat independent on paper during their marriage, their future generations would rule as monarchs of a united Spain. After a struggle to gain her throne, she mainly reformed and made her kingdom better after many bad moves by her brother Henry IV. She also oversaw Christopher Columbus' voyage to the New World. Neither Isabella or her husband were much for religious freedom as they gave Jewish and Muslims residents the choice of conversion to Catholicism or exile during the Spanish Inquisition.