Lothar- I was a Frankish emperor, whose attempt to gain sole rule over the Frankish territories was checked by his brothers. He was the Holy Roman Emperor from 817 to 855, co-ruling with his father until 840, and the governor of Bavaria from 815 to 817, King of Italy from 818 to 855 and Middle Francia (840–855).

Lothair was the eldest son of the Carolingian emperor Louis the Pious and his wife Ermengarde of Hesbaye. On several occasions, Lothair led his full-brothers Pepin I of Aquitaine and Louis the German in revolt against their father to protest against attempts to make their half-brother Charles the Bald a co-heir to the Frankish domains. Upon the father's death, Charles and Louis joined forces against Lothair in a three-year civil war (840–843). The struggles between the brothers led directly to the breakup of the Frankish Empire assembled by their grandfather Charlemagne and laid the foundation for the development of modern France and Germany.

Depicted here is a silver Dinar issued under his reign. It depicts a central cross with four besants on its obverse face. The reverse of a coin illustrates temple.

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