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Louis the Pious died the next year, and his empire was partitioned between his sons, Louis' father, Lothair, and Louis' uncle, Louis the German. Under his father's rule, he was crowned king and co-emperor to the middle-aged Emperor Lothair I at Rome by Pope Sergius II on 15 June 844. This ceremony mirrors the crowning of Lothair I by his father, a tradition started by Charlemagne and his son Louis the Pious, who were, respectively, great grandfather and grandfather of Louis II.