East Francia (Latin: Francia orientalis) or the Kingdom of the East Franks (Regnum Francorum orientalium) was a successor state of the Carolingian Empire ruled by the Carolingian dynasty until 911. It was established through the 843 Treaty of Verdun which divided the former kingdom of Francia into three kingdoms: Francia Orientalis (the East Frankish kingdom); Francia Media (the Middle Frankish kingdom); and Francia Occidentalis (the West Frankish kingdom).
The east–west division with the Treaty of Verdun, enforced by the Germanic-Latin language split, "gradually hardened into the establishment of separate kingdoms", with East Francia becoming (or being) the Kingdom of Germany, and West Francia becoming the Kingdom of France.