Most histories of the Garamantian kingdom end after its political collapse in the 4th century. However, the archaeological and written record seem to indicate that while the Garamantian kingdom may have died, the civilization that it spawned persisted well into the middle ages. 

Pop histories of the Garamantian civilization often posit that Garama died of thirst: the Garamantes used up the fossil water reserves they had depended on for centuries, sealing the destruction of their advanced irrigation system. However, various pieces of historical evidence cast doubt on this...