Western Desert (Egypt) as the "Libyan Desert", taking its name from Ancient Libya, which lay between the Nile and Cyrenaica. With the formation of the state of Libya, the term "Western Desert" has come to describe that part of the Sahara in Egypt. To the Ancient Greeks, the term Libya described the whole Saharan littoral west of the Nile to the Atlas mountains. During Roman times the term Libya was limited to Cyrenaica and the region between there and Egypt, which were organized as the provinces of Libya Superior and Libya Inferior. The term Libyan Desert then applied to the area to the
Ptolemais, Cyrenaica port for the city of Barca, inland, he transformed into a city that enclosed 280 hectares within its walls. Ptolemais probably served as the residence of the Ptolemaic governor of the region but, in spite of its large area, its population did not rival that of Cyrene, which under Roman rule became the capital of the region that, from then on, and still today, is called Cyrenaica. However, the term "Pentapolis" also continued to be used. Ptolemais became a Roman possession in 96 BC. It was soon included in the Roman province of Crete and Cyrenaica. With Diocletian's alteration of