中法兰克王国
Lothair I or Lothar I (Dutch and Medieval Latin: "Lotharius"; German: "Lothar"; French: "Lothaire"; Italian: "Lotario") (795 – 29 September 855) was emperor (817–855, co-ruling with his father until 840), and the governor of Bavaria (815–817), King of Italy (818–855) and Middle Francia (840–855).