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Lo·thair I(lō-thâr′, -târ′) 795?-855.
Frankish emperor (840-855). The Treaty of Verdun (843) divided Charlemagne's empire into three parts, and Lothair received the Middle Kingdom.
(Biography) ?795–855 ad, Frankish ruler and Holy Roman Emperor (823–30, 833–34, 840–55); son of Louis I, whom he twice deposed from the throne