paragraph: Spain's Golden Age: Under Ferdinand and Isabella, Spain underwent a dramatic transformation. In 1492 the royal pair presided over the final conquest over the Moors and discovery of the New World, including the great wealth that feat brought to Spain. Spain flourished during a Golden Age, a century of Spanish economic and political supremacy in international affairs, accompanied by marvels of art and literature. Ferdinand and Isabella were consummate Spaniards, committed to the expansion of the crown. By contrast, their grandson, who assumed the throne in 1516, was born in Flanders in 1500, and Charles I could barely express himself in Spanish. The first of the Habsburgs, he packed his retinue with Burgundian and Flemish nobles. Soon after his arrival in Spain, the young man inherited the title of Holy Roman Emperor, as Charles V. The responsibilities of the crown kept him busy away from the royal residences of Toledo, Segovia, Valladolid, and Madrid. While the monarch was away on one of his many business trips, his increasingly dissatisfied subjects protested violently. A revolt of the comuneros, or townsmen, broke out in a number of Spanish cities, including Madrid. The rebels occupied the alcázar, which had by then been converted to a royal palace. The insurrection was quashed and its leaders executed, but the king got the message. He tried thereafter to pay more attention to his Spanish constituency. 
question: What brought the great wealth during Spain's 100 years Golden Age?
answer: Columbus