Charles the Fat was the emperor of the Carolingian Empire from 881 to 887. A member of the Carolingian dynasty, Charles was the youngest son of Louis the German and Hemma, and a great-grandson of Charlemagne. He was the last Carolingian emperor of legitimate birth and the last to rule a united kingdom of the Franks. 832 – January 13, 888; died at about 56. Alive at the same time as Muḥammad ibn Musa al-Khwarizmi, Farabi, Ahmad ibn Hanbal, Rudaki, and Alfred the Great. Wiki link