The answer is A) It united the people of Charlemagne’s empire. One of the two sons of Pepin the Short, who took power after his death. Original name is Charles. Charlemagne built an empire greater than any known since ancient Rome. Conquered new lands to both the south and the east, and spread Christianity through conquest. Reunited Western Europe for the first time since the Roman Empire, and had become the most powerful king in Western Europe. One of his greatest achievements was the encouragement of learning.