In 639 an army of some 4,000 men was sent against Egypt by the second caliph, Umar, under the command of Amr ibn al-As. This army was joined by another 5,000 men in 640 and defeated a Byzantine army at the battle of Heliopolis. Amr next proceeded in the direction of Alexandria, which was surrendered to him by a treaty signed on November 8, 641.
Alexandria was regained for the Byzantine Empire in 645 but was retaken by Amr in 646. In 654 an invasion fleet sent by Constans II was repulsed. From that time no serious effort was made by the Byzantines to regain possession of the country.
In return for a tribute of money and food for the troops of occupation, the Christian inhabitants of Egypt were excused military service and left free in the observance of their religion and the administration of their affairs.
Conversions of Copts to Islam were at first rare, and the old system of taxation was maintained for the greater part of the first Islamic century. The old division of the country into districts (nomoi) was maintained, and to the inhabitants of these districts demands were directly addressed by the governor of Egypt, while the head of the community—ordinarily a Copt but in some cases a Muslim Egyptian—was responsible for compliance with the demand.
The resentment of the Copts against taxation, however, led to a revolt in 725. In 727, to strengthen Arab representation, a colony of 3,000 Arabs was set up near Bilbeis. Meanwhile, the employment of the Arabic language had been steadily gaining ground, and in 706 it was made the official language of the government. Egyptian Arabic, the modern language of Egypt, began to form. Other revolts of the Copts are recorded for the years 739 and 750, the last year of Umayyad domination. The outbreaks in all cases are attributed to increased taxation.
The Abbasid period was marked by new taxations, and the Copts revolted again in the fourth year of Abbasid rule. At the beginning of the 9th century the practice of ruling Egypt through a governor was resumed under Abdallah bin Tahir, who decided to reside at Baghdad, sending a deputy to Egypt to govern for him. In 828 another Egyptian revolt broke out. And in 831 the Copts joined with native Muslims against the government.
In the 9th century Egypt was mostly governed by Turks (Tulunids, Ikhshidids) ruling in the name of the Muslim governor. Egypt came into conflict with Syria and the Caliphate until peace was made in 891. In 914 Egypt was invaded for the first time by a Fatimid force sent by the Caliph al-Mahdi Obaidallah, now established at Kairawan. The Mahdi's son succeeded in taking Alexandria in 919, and Egypt wasn't freed from the invaders until the year 921, when reinforcements had been repeatedly sent from Baghdad to deal with them. In 969 the Fatimid general Jawhar as-Siqilli was placed at the head of an army said to number 100,000 men and attempted to seize Egypt. He had little difficulty defeating the Egyptian army. And on July 6, 969, he entered Fostat at the head of his forces. Egypt was transferred from the Eastern to the Western caliphate.
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