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Charles the Bald
It's from de:, and though they don't have footnoted it, it's obviously ""Reinhard Lebe: War Karl der Kahle wirklich kahl? Historische Beinamen – und was dahintersteckt. dtv 2003, ISBN 3-42330-876-1."" (roughly ""Was Charles the Bald really bald? Historical epithets and the story behind them"").   "