deference to the Jewish population, who were numerous in the Sassanid army. Muslim conquest and Rashidun caliphate Hebron was one of the last cities of Palestine to fall to the Islamic invasion in the 7th century, possibly the reason why Hebron is not mentioned in any traditions of the Arab conquest. When the Rashidun Caliphate established its rule over Hebron in 638, the Muslims converted the Byzantine church at the site of Abraham's tomb into a mosque. It became an important station on the caravan trading route from Egypt, and also as a way-station for pilgrims making the yearly hajj from Damascus. After the fall of the city, Jerusalem's conqueror, Caliph Omar ibn al-Khattab permitted Jewish people to return and to construct a small synagogue within the Herodian precinct. Umayyad period Catholic bishop Arculf, who visited the Holy Land during the Umayyad period, described the city as unfortified and poor. In his writings he also mentioned camel caravans transporting firewood from Hebron to Jerusalem, which implies there was a presence of Arab nomads in the region at that time. Trade greatly expanded, in particular with Bedouins in the Negev (al-Naqab) and the population to the east of the Dead Sea (Baḥr Lūṭ). According to Anton Kisa, Jews from Hebron (and Tyre) founded the Venetian glass industry in the 9th century. Fatimid and Seljuk periods Islam did not view the town as significant before the 10th century, it being almost absent in Muslim literature of the period. Jerusalemite geographer al-Muqaddasi, writing in 985 described the town as follows:Habra (Hebron) is the village of Abraham al-Khalil (the Friend of God)...Within it is a strong fortress...being of enormous squared stones. In the middle of this stands a dome of stone, built in Islamic times, over the sepulchre of Abraham. The tomb of Isaac lies forward, in the main building of the mosque, the tomb of Jacob to the rear; facing each prophet lies his wife. The enclosure has been converted into a mosque, and built around it are rest houses for the pilgrims, so that they adjoin the main edifice on all sides. A small water conduit has been conducted to them. All the countryside around this town for about half a stage has villages in every direction, with vineyards and grounds producing grapes and apples called Jabal Nahra...being fruit of unsurpassed excellence...Much of this fruit is dried, and sent to Egypt. In