Which statement about Charlemagne's achievements is not true? A. He was crowned the first emperor of the Holy Roman Empire by Pope Leo III in a lavish ceremony in Rome. B. He was a king of the Saxons who resisted the pope's efforts to spread Christianity throughout Gaul. C. He waged war against the Lombards and the Moors and greatly expanded the territory of his empire. D. He established schools and supported monasteries in their efforts to preserve learning.