The Carolingian Empire originated from the weak Frankish Kingdom. Charles Martel, the powerful Mayor of the Palace, defeated the Muslims in 732 and his son Pippin the Short became king in 751 after defeating the Frankish king. Pippin's son Charlemagne sought to rebuild the Western Roman Empire by conquering the Lombard Kingdom and defeating the Saxons. In 800, Charlemagne was crowned emperor by the Pope. Upon his death in 814, Charlemagne's son Louis the Pious became emperor but the empire was divided among his three sons by the Treaty of Verdun in 843.