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).. Lothair was the eldest son of the Carolingian emperor Louis the Pious and his wife Ermengarde ...

Lothair III, sometimes numbered Lothair II and also known as Lothair of Supplinburg (1075 – 4 December 1137), was Holy Roman Emperor from 1133 until his death. He was appointed Duke of Saxony in 1106 and elected King of Germany in 1125 before being crowned emperor in Rome. The son of the Saxon count Gebhard of Supplinburg, his reign was troubled by the constant …