Lothair I[lō-thârˈ, -târˈ] 795?-855.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Holy Roman emperor (840-855). In the Treaty of Verdun (843) the empire was divided into three parts, and Lothair received the Middle Kingdom.