Original: The last Muslim ruler of Granada , Muhammad XII , better known as Boabdil , surrendered his kingdom to Ferdinand II of Aragon and Isabella I of Castile , the Catholic Monarchs ( los Reyes Católicos ) .
Simplified: The last Muslim ruler of Granada surrendered ( gave up ) his kingdom to Ferdinand II of Aragon and Isabella I of Castile , the Catholic kings ( los Reyes Católicos ) .