Umayyad Caliphate
Domestic consolidation and centralization

Iraq remained politically unstable and the garrisons of Kufa and Basra had become exhausted by warfare with Kharijite rebels. In 694 Abd al-Malik combined both cities as a single province under the governorship of al-Hajjaj, who oversaw the suppression of the Kharijite revolts in Iraq and Iran by 698 and was subsequently given authority over the rest of the eastern caliphate. Resentment among the Iraqi troops towards al-Hajjaj's methods of governance, particularly his death threats to force participation in the war efforts and his reductions to their stipends, culminated with a mass Iraqi rebellion against the Umayyads in c. 700. The leader of the rebels was the Kufan nobleman Ibn al-Ash'ath, grandson of al-Ash'ath ibn Qays. Al-Hajjaj defeated Ibn al-Ash'ath's rebels at the Battle of Dayr al-Jamajim in April. The suppression of the revolt marked the end of the Iraqi muqātila as a military force and the beginning of Syrian military domination of Iraq. Iraqi internal divisions, and the utilization of more disciplined Syrian forces by Abd al-Malik and al-Hajjaj, voided the Iraqis' attempt to reassert power in the province.

To consolidate Umayyad rule after the Second Fitna, the Marwanids launched a series of centralization, Islamization and Arabization measures. To prevent further rebellions in Iraq, al-Hajjaj founded a permanent Syrian garrison in Wasit, situated between Kufa and Basra, and instituted a more rigorous administration in the province. Power thereafter derived from the Syrian troops, who became Iraq's ruling class, while Iraq's Arab nobility, religious scholars and mawālī became their virtual subjects. The surplus from the agriculturally rich Sawad lands was redirected from the muqātila to the caliphal treasury in Damascus to pay the Syrian troops in Iraq. The system of military pay established by Umar, which paid stipends to veterans of the earlier Muslim conquests and their descendants, was ended, salaries being restricted to those in active service. The old system was considered a handicap on Abd al-Malik's executive authority and financial ability to reward loyalists in the army. Thus, a professional army was established during Abd al-Malik's reign whose salaries derived from tax proceeds.

In 693, the Byzantine gold solidus was replaced in Syria and Egypt with the dinar. Initially, the new coinage contained depictions of the caliph as the spiritual leader of the Muslim community and its supreme military commander. This image proved no less acceptable to Muslim officialdom and was replaced in 696 or 697 with image-less coinage inscribed with Qur'anic quotes and other Muslim religious formulas. In 698/99, similar changes were made to the silver dirhams issued by the Muslims in the former Sasanian Persian lands of the eastern caliphate. Arabic replaced Persian as the language of the dīwān in Iraq in 697, Greek in the Syrian dīwān in 700, and Greek and Coptic in the Egyptian dīwān in 705/06. Arabic ultimately became the sole official language of the Umayyad state, but the transition in faraway provinces, such as Khurasan, did not occur until the 740s. Although the official language was changed, Greek and Persian-speaking bureaucrats who were versed in Arabic kept their posts. According to Gibb, the decrees were the "first step towards the reorganization and unification of the diverse tax-systems in the provinces, and also a step towards a more definitely Muslim administration". Indeed, it formed an important part of the Islamization measures that lent the Umayyad Caliphate "a more ideological and programmatic coloring it had previously lacked", according to Blankinship.

In 691/92, Abd al-Malik completed the Dome of the Rock in Jerusalem. It was possibly intended as a monument of victory over the Christians that would distinguish Islam's uniqueness within the common Abrahamic setting of Jerusalem, home of the two older Abrahamic faiths, Judaism and Christianity. An alternative motive may have been to divert the religious focus of Muslims in the Umayyad realm from the Ka'aba in Zubayrid Mecca (683–692), where the Umayyads were routinely condemned during the Hajj. In Damascus, Abd al-Malik's son and successor al-Walid I (r. 705–715) confiscated the cathedral of St. John the Baptist and founded the Great Mosque in its place as a "symbol of the political supremacy and moral prestige of Islam", according to historian Nikita Elisséeff. Noting al-Walid's awareness of architecture's propaganda value, historian Robert Hillenbrand calls the Damascus mosque a "victory monument" intended as a "visible statement of Muslim supremacy and permanence".
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