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
Cyrenaica of Nicaea in 325. The subscriptions at Ephesus (431) and Chalcedon (451) give the names of two other bishops, Zenobius and Theodorus. Although it retained the title "Pentapolis", the ecclesiastic province actually included all of the Cyrenaica, not just the five cities. Pentapolis is still included in the title of Popes of the Coptic Orthodox Church and the Greek Orthodox Church of Alexandria. Cyrenaica was conquered by Muslim Arabs during the tenure of the second caliph, Omer Bin Khattab, in 643/44, and became known as Barqah after its provincial capital, the ancient city of Barce. After the breakdown of the