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In page Charlemagne:

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Pepin died in 810 and Charles in 811. Charlemagne then reconsidered the matter, and in 813, crowned his youngest son, Louis, co-emperor and co-King of the Franks, granting him a half-share of the empire and the rest upon Charlemagne's own death. The only part of the Empire that Louis was not promised was Italy, which Charlemagne specifically bestowed upon Pippin's illegitimate son Bernard.[1]