, 7th/8th century AD Although the Arab sources give the impression that the Arabs began their conquest of the region in the 650s, in reality most of the early warfare in the area were little more than raids aiming at seizing booty and extracting tribute. Indeed, Arab presence was limited to a small garrison at
Marw, and armies were sent by the governors of
Iraq every year to raid and plunder the native principalities. A common feature of the narratives is the agreement of tribute by the various cities, whether in money or measures of wheat and barley.
First Muslim incursions, 651–658 Pursuing the Sasanian shah,
Yazdegerd III, the Arabs under Abdallah ibn Amir and his lieutenant,
Ahnaf ibn Qais, entered Khorasan in 651. Abandoned by his local governors, who resented his overbearing demands and harboured designs for autonomy, Yazdegerd was killed by a local peasant. The local Persian resistance was defeated by the Arabs, despite the intervention of the Hephthalites of
Herat. The Arabs imposed tribute on the Persian governors and cities of Khorasan, before marching on Herat, whose ruler likewise agreed to the payment of tribute. Ahnaf was then sent to invade Tokharistan in 652 with 4,000 Arabs and 1,000 Iranian converts (). The city of
Marw al-Rudh was forced to capitulate and become a tributary ally of the Arabs. When marching against Lower Tokharistan, Ahnaf was opposed by the united forces of the local princes, reportedly 30,000 men, and suffered heavy losses. A second expedition under al-Aqra ibn Habis was able to defeat the prince of Juzjan, and occupy Juzjan,
Faryab,
Talaqan, and Balkh. Detachments of Arabs plundered far and wide, some reaching as far as Khwarizm. With the onset of winter, Ibn Amir left only 4,000 men at Marw, and returned to his base in Iraq. In 654, the Arabs reportedly raided the town of Mayamurgh in Sogdia, but their position was shaky: the Arab garrisons were very small, and the loyalty of the local princes dubious. As the historian
Michael G. Morony emphasizes, their promises of tribute were more a "temporary expedient to secure their own positions, sometimes, against local rivals, with Muslim military backing", and not a firm commitment to the Arab cause. Furthermore, until the early 8th century, Muslim forces in the region were usually outnumbered by those of the native rulers; while they sufficed to subdue individual cities and force them to pay tribute, the Arab armies were unable to impose permanent control on the native principalities. As a result, very soon after Ibn Amir's departure, the local population, led by a certain Qarin (possibly a member of the
House of Karen), rose in revolt. Ibn Amir reacted with alacrity, sending generals to the region who scored some success—the rebel leader Qarin was captured or killed and Muslim armies campaigned as far as
Bust and
Zabul in what is now southern
Afghanistan. Nevertheless, with the outbreak of the
First Fitna (656–661), Arab authority collapsed across Khorasan. According to Chinese sources, the princes of Tokharistan restored Yazdegerd III's son
Peroz as titular king of Persia for a time. Preoccupied with their civil war the Arabs were unable to react, although raiding expeditions continue to be recorded in 655–658.
Second wave of Muslim attacks, 661–683 After the end of the civil war, Abdallah ibn Amir was again entrusted with restoring Muslim control over Khorasan by the new
Umayyad Caliphate. The exact events of the next few years are unclear as the historical traditions confuse them with Ibn Amir's original conquest of the area, but what information there is, mostly from Arab tribal accounts, suggests occasional fierce resistance and rebellions, leading to acts like the destruction of the Nawbahar stupa by Ibn Amir's deputy,
Qays ibn al-Haytham al-Sulami. Herat,
Pushang, and Badghis are reported to have returned to paying tribute by 663. It was not until the appointment of
Ziyad ibn Abi Sufyan to the government of Iraq and the eastern Caliphate that the Arabs undertook a systematic pacification campaign in Khorasan. From 667 until he died in 670, Ziyad's deputy in Khorasan, al-Hakam ibn Amr al-Ghifari, led a series of campaigns in Tokharistan, which saw Arab armies crossing the Oxus into Chaghaniyan in the process. Peroz was evicted and once again fled to China. Al-Hakam's death was followed by another large-scale uprising, but his successor,
Rabi ibn Ziyad al-Harithi, took Balkh and defeated a revolt in
Quhistan, before crossing the Oxus to invade Chaghaniyan. Other Arab forces secured the crossing points of Zamm and Amul further west, while the Arab sources mention a conquest of Khwarizm simultaneously. More importantly for the future of Muslim presence in the region, in 671 Ziyad ibn Abi Sufyan settled 50,000 warriors, drawn from the Iraqi
garrison cities of
Basra and
Kufa, with their families in Marw and other cities of the region, such as
Nishapur,
Abiward,
Sarakhs and Herat. This move not only immensely bolstered the Muslim element and rule in Khorasan but also provided the forces necessary for future expansion into Transoxiana. While previously annual expeditions had to be mustered and sent from Iraq, now a large pool of manpower was available on the very frontier of the caliphate, eager to make their fortune in wars of conquest. At the same time, the Iraqi tribes brought with them a strong regional identity and their rivalries, notably the
Qays–Yaman factionalism, which in Khorasan came to exceed in ferocity the rivalries seen in Iraq, and repeatedly placed Arab Muslim rule of the region at risk of collapse. When Ziyad died, his policies were continued by his son,
Ubayd Allah ibn Ziyad, appointed governor of Khorasan, who arrived in Marw in autumn 673. In the following spring, Ubayd Allah crossed the Oxus and invaded the principality of Bukhara, which at the time was led by the queen mother or
khatun, a Turkic title meaning "lady", as regent for her infant son
Tughshada. The Arabs achieved their first success near the town of before marching on to Bukhara itself. The local historical tradition records that the Arabs besieged Bukhara and that the Turks were called for help. This is missing in the Arab sources, stating that the Arabs won a great victory over the Bukharans. Following a common practice at the time, Ubayd Allah recruited 2000 captives, all "skillful archers", as his personal guard. Bukhara acknowledged some form of Arab suzerainty and was obliged to pay a tribute of a million silver
dirhams. Ubayd Allah's success was not followed up by his successors,
Aslam ibn Zur'a and
Abd al-Rahman ibn Ziyad, apart from launching summer raids across the Oxus. Only during the brief governorship of
Sa'id ibn Uthman in 676 did the Arabs launch a major expedition into Sogdia. According to
al-Baladhuri and
Narshakhi, Sa'id defeated a local coalition comprising the cities of Kish, Nasaf, Bukhara, and the Turks, compelled the Khatun to re-affirm Bukhara's allegiance to the Caliphate, and then marched onto Samarkand, which he besieged and captured after three days. He then took young nobles (variously given as 40, 50 or 80) as hostages, who were later executed at
Medina, and on his return journey captured
Tirmidh on the Oxus and received the surrender of the prince of Khuttal. In 681, another son of Ziyad,
Salm, was appointed as governor of Khorasan. Eager to emulate his brother, he recruited in
Basra for an offensive across the Oxus, including such renowned warriors as
Abd Allah ibn Khazim al-Sulami and
al-Muhallab ibn Abi Sufra. Salm began a series of raids over the river, which ranged as far as Shash and Khwarizm (imposing a tribute of 400,000 dirhams on the region), and again subdued Bukhara, which had rebelled again in the meantime. The timing was favourable for the Arabs, since the Transoxianan princes could expect little support from elsewhere: the Khaganate had been destroyed, and the power of the nascent
Tibetan Empire kept Chinese ambitions in Central Asia in check. Salm's plans, however, were Arab conquests, interrupted by the outbreak of a new civil war, the
Second Fitna (683–692).
Tribal turmoil in Khorasan, 683–704 silver
dirham, minted in 683/84 in the name of Abd Allah ibn Khazim The Second Fitna put an end to Muslim expansion in Central Asia for a generation. In the absence of centrally-appointed governors, Khorasan was engulfed by intertribal warfare among the Arab settlers, while local princes withheld tribute and the Hephthalite princes even launched raids into Khorasan. After massacring some 8,000 of his rivals from the
Rabi'a and
Bakr ibn Wa'il tribes, the
Mudari leader Abd Allah ibn Khazim al-Sulami established himself as the de facto ruler of Khorasan until 691, when the victorious Umayyads encouraged his rivals to revolt, leading to his death. The remnants of Abd Allah's followers fled to the fortress town of
Tirmidh on the Oxus, where Abd Allah's son,
Musa, had established himself with a band of adventurers as a quasi-independent ruler.
Umayya ibn Abdallah ibn Khalid ibn Asid, a prince of the Umayyad dynasty, was appointed as the new governor in 691, and managed to restore Lower Tokharistan to at least nominal Arab suzerainty. His attempt to expel Musa from Tirmidh, however, failed, although the Arab attack was joined by a simultaneous Turkic one. The restiveness of the Arabs of Khorasan was to be a major problem for the Umayyad governors. On the one hand, in a bid to keep the Arab settlers occupied and placate them with the prospect of plunder, they sought to conquer territory across the Oxus, but on the other, the volatile tribal politics doomed such efforts. Thus in 696, Umayya was abandoned beyond the Oxus by his second-in-command, who tried to seize control of Marw, and had to conclude a quick and humiliating peace with the Bukharans after being encircled and almost destroyed. Umayya also faced the dissatisfaction of the Iranian , who despite being converts to Islam were obliged to pay the tax. As a result, Khorasan was attached to the eastern viceroyalty of the powerful governor of Iraq,
al-Hajjaj ibn Yusuf, who appointed the famous
Azdi warrior-leader al-Muhallab ibn Abi Sufra as his governor in the province. His campaigns were not much more successful: he blockaded Kish for two years, but failed to conquer it and had to satisfy himself with the extraction of tribute from the city. At the same time, his sons,
Yazid and Habib, led secondary expeditions against Khuttal and Rabinjan, which also failed to achieve much. After al-Muhallab's death in 702, he was succeeded by his son Yazid, who did not launch any campaigns during his two-year governorship, apart from a raid into Khwarizm. Worse, Yazid's championing of his own tribe, the Azd, alienated many among the other Arab tribes; and his mistreatment of the chief leaders, Hurayth and Thabit ibn Qutba, provoked their defection to Musa. The latter now became a rallying figure for opposition to Umayyad rule: he was joined by aristocratic Iranian , disaffected Arabs from Khorasan, 8,000 refugees from
Ibn al-Ash'ath's failed anti-Umayyad uprising in Iraq, and gained the support of the prince of Chaghaniyan and
Nezak Tarkhan of Badghis. Even
Narsieh, a son of Peroz and purported heir to the Sasanian crown, appeared in Tokharistan. Musa had to tread a careful balance between his Iranian supporters, who favoured an invasion of Khorasan and the expulsion of the Arabs, and his Arab followers, who feared losing their eminent status in the event of an Iranian restoration and preferred supplanting Umayyad authority with their own. As a result Musa limited himself to the expulsion of the Umayyad governors from Chaghaniyan and Lower Tokharistan, which was apparently swiftly and easily accomplished. Musa's nascent independent rule faltered, however, on the dissensions between Arabs and Iranians. Open conflict broke out when Musa's Iranian followers, led by Thabit ibn Qutba, rebelled, with the backing of the native princes. While Musa prevailed over his erstwhile companions, this was a hollow victory, as it estranged the cause of the Arabs of Tirmidh from the native princes. The persistent disunity of the Transoxianian princes, riven by their own feuds, and failing to recognize the still persistent danger of an Arab conquest, would be suitably exploited by the Umayyad governors. Already in 704, the Umayyad commander Uthman ibn Mas'ud was able to ally with some native princes and defeat and kill Musa, capturing Tirmidh. == Later conquests and consolidation of Arab rule ==