Whakaotihia te rerenga e whai ake nei: Ko nga whakahoutanga Tetrarchy a Diocletian o te 296 i whakarereke i te hanganga whakahaere o Cyrenaica. I wehea ki nga kawanatanga e rua: Libya Superior, Libya Pentapolis ranei, kei roto ko te Pentapolis i whakahuatia i runga ake nei, me Cyrene hei whakapaipai, me Libya Inferior, Libya sicca ranei, te Marmarica, i taua wa i whiwhi i tetahi taone nui, te tauranga Paraetonium. I raro i ia kāwanatanga he kawana, he rangatiratanga iti, he "praeses". Ko nga mea e rua no te Diocese o te Rawhiti, me tona taone nui i Anatioka i Hiria, mai i te 370, ki te Diocese o Ihipa, i roto i te kawanatanga o Oriens. Ko tana hoa noho tata ki te hauauru o Tripolitania, te wehe nui mai i Africa proconsularis, i uru ki roto i te Diocese o Awherika, i raro i te kawanatanga o "Italia et Africa". Whai muri i te
I muri i te ruu o Kerete i te tau 365, ka nekehia te whakapaipai ki Ptolemais. Whai muri i te wehenga o te Emepaea, ka uru a Cyrenaica ki te Emepaea o Roma ki te Rawhiti (Byzantine Empire), e rohe ana ki Tripolitania. He waahanga poto o te Basileia o Vandal ki te hauauru, tae noa ki tana whiwhinga mai e Belisarius i te 533.