Garamantes: Timeline

70   Romans Roman Empire

The Roman Empire was a phase of the ancient Roman [i] civilization characterized by an autocratic [i] ... 

 make a punitive expedition against Garamantes - they are forced to have an official relationship with the Empire.

569   King of Garamantes signs a peace treaty with Byzantium Byzantium

Byzantium was an ancient Greek [i] city-state [i], which according to legend was founded ... 

668   Arab Arab

The Arabs are predominantly speakers of the Arabic language [i], rather than a pure ethnic group [i], ... 

 forces conquer the Garamantes.