Jund al-Urdunn
The region was annexed to the Rashidun Caliphate after the Muslim victory over the Byzantine Empire at the Battle of Yarmouk, and became known as the province of "Bilad al-Sham". During the Umayyad Caliphate, the Shām was divided into five "junds" or military districts. They were "Jund Dimashq" (for the area of Damascus), "Jund Ḥimṣ" (for the area of Homs), "Jund Filasṭīn" (for the area of Palestine) and "Jund al-Urdunn" (for the area of Jordan). Later "Jund Qinnasrîn" was created out of part of Jund Hims. The city of Damascus was the capital of the Islamic Caliphate, until the rise of the Abbasid Caliphate.