The expanded Frankish state Charlemagne founded was called the Carolingian Empire.
The oldest son of Pepin the Short and Bertrada of Laon, Charlemagne became king in 768 following the death of his father. He was initially co-ruler with his brother Carloman I. Carloman's sudden death in 771 under unexplained circumstances left Charlemagne as the undisputed ruler of the Frankish Kingdom. Charlemagne continued his father's policy towards the papacy and became its protector, removing the Lombards from power in northern Italy, and leading an incursion into Muslim Spain. He also campaigned against the Saxons to his east, Christianizing them upon penalty of death, leading to events such as the Massacre of Verden. Charlemagne reached the height of his power in 800 when he was crowned Emperor of the Romans by Pope Leo III on Christmas Day at Old St. Peter's Basilica.