region (Upper Mesopotamia) in the 8th century. Iyad played a leading role in the Muslim conquest of the region. When Abu Ubayda died in 639, Caliph Umar appointed Iyad in his place as the
ʿamal (governor) of
Hims,
Qinnasrin (Chalcis) and al-Jazira with directions to conquer the latter territory from its Byzantine commanders because they had refused to pay the tributes promised to the Muslims in 638. By the time Iyad was given his assignment, all of Syria had been conquered by the Muslims, leaving the Byzantine garrisons in al-Jazira isolated from the empire. In August 639, Iyad led a 5,000-strong army toward
Raqqa (Kallinikos) in al-Jazira and raided the city's environs. He encountered resistance from its defenders, prompting him to withdraw and send smaller units to make raids around Raqqa, seizing captives and harvests. After five or six days of these raids, Raqqa's
patrician negotiated the surrender of the city to Iyad. According to historian
Michael Meinecke, Iyad captured the city in 639 or 640. After Raqqa, Iyad proceeded toward
Harran, where his progress was stalled. He diverted part of his army to
Edessa, which ultimately capitulated after negotiations. Iyad then received Harran's surrender and dispatched
Safwan ibn Mu'attal al-Sulami and his own kinsman
Habib ibn Maslama al-Fihri to seize
Samosata, which also ended in a negotiated surrender after Muslim raiding of its countryside. By 640, Iyad had successively conquered
Saruj,
Jisr Manbij and Tell Mawzin. Before the capture of Tell Mawzin, Iyad attempted to take
Ras al-Ayn, but retreated after stiff resistance. Later, he dispatched
Umayr ibn Sa'd al-Ansari to take the city. Umayr first assaulted the rural peasantry and seized cattle in the town's vicinity. The inhabitants barricaded inside the walled city and inflicted heavy losses on the Muslim forces, before ultimately capitulating. About the same time, Iyad besieged Samosata in response to a rebellion, the nature of which is not specified by al-Baladhuri, and stationed a small garrison in Edessa after the city's inhabitants violated their terms of surrender. After Samosata, al-Baladhuri, who gives a detailed but triumphalist account of the Mesopotamian campaign, maintains that Iyad subdued a string of villages "on the same terms" as Edessa's surrender. Between the end of 639 and December 640, Iyad and his lieutenants subdued, in succession,
Circesium (al-Qarqisiya),
Amid,
Mayyafariqin,
Nisibin,
Tur Abdin,
Mardin,
Dara,
Qarda and
Bazabda. According to al-Baladhuri, with the exception of Nisibin, which put up resistance, all these cities and fortresses fell to the Muslims after negotiated surrenders. In contrast to al-Baladhuri's passive account of Iyad's capture of Dara, 10th-century historian
Agapius of Hierapolis wrote that many were slain on both sides, particularly among the Muslims, but the city ultimately fell after a negotiated surrender. Iyad continued toward
Arzanene, then to
Bitlis and finally to
Khilat; all three cities surrendered after negotiations with their patricians. Shortly after, Iyad entrusted the leader of
Bidlis with collecting the land tax from Khilat, and left for
Raqqa. On the way there, one medieval Muslim report holds that Iyad dispatched a force to capture
Sinjar, after which he settled it with
Arabs. Iyad died in
Hims in 641. According to al-Tabari, Iyad was succeeded as governor of Hims and Qinnasrin by a certain
Sa'id ibn Hidhyam al-Jumahi, but the latter died soon after and Umayr ibn Sa'd, one of Iyad's lieutenants, was appointed in his place by Caliph Umar.
Assessment According to 9th-century biographer
Ibn Sa'd, "not a foot was left of Mesopotamia unsubdued by Iyad ibn Ghanm", and Iyad "effected the conquest of Mesopotamia and its towns by capitulation, but its land by force". Petersen describes Iyad as "a commander who has received little attention, but who clearly was of great ability". The tactics used by Iyad in his Mesopotamian campaign were similar to those employed by the Muslims in
Palestine, though in Iyad's case the contemporary accounts reveal his specific
modus operandi, particularly in Raqqa. The operation to capture that city entailed positioning cavalry forces near its entrances, preventing its defenders and residents from leaving or rural refugees from entering. Concurrently, the remainder of Iyad's forces cleared the surrounding countryside of supplies and took captives. These dual tactics were employed in several other cities in al-Jazira. They proved effective in gaining surrenders from targeted cities running low on supplies and whose satellite villages were trapped by hostile troops. Iyad's overall goal was to conquer al-Jazira with minimal damage to ensure the flow of revenue to the caliphate. In the agreements he reached with the patricians of Raqqa, Edessa, Harran and Samosata, payments came in various forms, including cash, wheat, oil, vinegar, honey, labor services to maintain roads and bridges, and guides and intelligence for the Muslim newcomers. Ultimately, Iyad's settlements with Mesopotamia's cities "to a large extent left most of local society untouched". In the view of Petersen, Iyad's campaign partially diverted the Byzantines' attention away from the Muslims' central offensive against Syria's port cities and the province of
Egypt, while also "demonstrating to the
Armenian nobility that the Caliphate had become a viable alternative to the Persian Empire". ==References==