Marmarica
The territory stretched to the far south, encompassing the Siwa Oasis, which at the time was known for its sanctuary to the deity Amun.Marmarica proper was delimited towards the east by the escarpment of Catabathmus Magnus, now known as Akabah el-Kebir, at Salum.Under the Roman Empire, Marmarica included the Libycus Nomus, located between the Catabathmus and the Bay of Plinthine (Sinus Plinthinetes).The inhabitants of Marmarica were known generically as Marmaridae (Μαρμαρίδαι),[3] but they are given the special names of Adyrmachidae (Ἀδυρμαχίδαι) and Giligammae (Γιλιγάμμαι and Γιλιγάμβαι) in the coastal districts, and of Nasamones (Νασαμῶνες) and Augilae (Αὔγιλαι and Αὐγιλίται) in the interior.The territory south of the Libyan Nomos was inhabited by the Ammonii (Ἀμμώνιοι), centered on the celebrated and fertile oasis of Ammon (Siwa) Both Cyrenaica and Marmarica were included in the diocese of Egypt in the 4th century, within the larger Praetorian prefecture of the East (while Tripolitania was in the Praetorian prefecture of Italy).