Ptolemy wrote that in 50 AD Septimius Flaccus carried out his expedition in order to retaliate against nomad raiders who attacked Leptis Magna, and reached Sebha and the territory of Aozou[6]. He then reached the rivers Bahr Erguig, Chari and Logone in the lake Chad area, described as the "land of Ethiopes" (or black men) and called Agisymba.