1. Charles the Bald
  2. Lothair I
  3. Louis the German
  4. Louis the Pious

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Answer: Option 4

Louis I (778-840), or Louis the Pious, was king of the Franks and emperor of the West from 814 to 840. The son and successor of Charlemagne, he was the last ruler to maintain the unity of the Carolingian Empire. Born in Aquitaine, Louis I was the third son of Charlemagne and his second wife, Hildegard.