1A - Islam c1071: Muslim expansion and the rise of the Seljuk Turks
Learn how Islam united a wide religious world while rival dynasties divided political power, and why Seljuk expansion threatened Byzantium without creating a single Muslim response to the crusaders.
Islam and the growth of a religious world
Islam emerged in seventh-century Arabia through the teaching of Muhammad. Muslims recognised one God, accepted the Qur'an as revelation and understood themselves as part of the umma, the community of believers. Religious obligations included prayer, charity, fasting and pilgrimage to Mecca. These shared beliefs linked people across languages and regions, but they did not make all Muslim rulers politically united.
After Muhammad's death in 632, armies under the early caliphs conquered territories including Syria, Palestine and Egypt from Byzantium and overran the Sasanian Persian Empire. The Umayyad dynasty ruled a far-reaching empire from Damascus; the Abbasids took power in 750 and centred their rule on Baghdad. By the eleventh century, Islam connected lands from Iberia and North Africa to Iran and beyond. Many inhabitants of those lands remained Christian or Jewish: conquest, political rule and conversion were different processes, and conversion occurred unevenly over time.
Jerusalem was also sacred to Muslims. Its significance was connected with Muhammad's Night Journey and the site of the al-Aqsa mosque, as well as earlier prophetic traditions. Christian and Muslim attachment to the same place helps explain its later symbolic importance. It does not establish that every struggle for the city had only a religious cause.
Caliph
A ruler claiming succession to Muhammad's leadership of the Muslim community. By the eleventh century, a caliph's religious prestige and effective military or territorial power could be very different.
Sunni and Shi'a authority in the Near East
Disagreement over legitimate leadership helped produce the distinction between Sunni and Shi'a Islam. Shi'a traditions gave special importance to the family of Muhammad, particularly Ali and his descendants. Sunnis accepted a different succession tradition and developed their own schools of law. The categories contained considerable diversity, so they should not be treated as two uniform armies.
Around 1071, the Abbasid caliph in Baghdad was a major focus of Sunni legitimacy, but his practical power had been restricted by military rulers. The Fatimid dynasty, whose rulers claimed an Isma'ili Shi'a caliphate, governed Egypt from Cairo and competed for influence in Syria and Palestine. Two rival caliphates claimed religious authority. The region also included local rulers, city elites, tribal groups and Christian communities with their own interests.
This religious rivalry interacted with geography and resources. Egypt's Nile agriculture and access to sea routes gave the Fatimids a substantial base. Syria lay between competing powers and contained separate centres such as Aleppo and Damascus. A ruler could ally with an opponent's enemy for immediate security even when religious rhetoric suggested a larger unity. Consequently, an explanation of Muslim conduct must identify the ruler and the circumstances rather than attribute one motive to 'Islam'.
How the Seljuk Turks gained power
The Seljuks were a Turkic dynasty of Central Asian origins who adopted Sunni Islam. Their defeat of the Ghaznavids at Dandanqan in 1040 helped establish their power in Iran. In 1055, Tughril entered Baghdad and displaced Buyid control. The Seljuk ruler exercised military authority while presenting himself as a protector of the Abbasid caliph. The title sultan distinguished this effective ruling power from the caliph's position.
Seljuk expansion drew strength from mobile mounted warriors and the resources of conquered territories. Horse archers could raid, disrupt supplies and draw less mobile opponents into danger. Rulers also used established Persian administrators to govern settled populations. The combination matters: an empire needed taxation, administration and political legitimacy as well as battlefield skill. The Metropolitan Museum's account places the dynasty's rise in this wider Iranian setting.
Alp Arslan, sultan from 1063, expanded Seljuk influence and defeated the Byzantine emperor Romanos IV at Manzikert in 1071. Turkish movement into Anatolia was not always centrally directed by the sultan; migrating and raiding groups could pursue local opportunities. The victory therefore formed part of a changing frontier rather than a single completed plan to destroy Byzantium.
Malik Shah, who ruled from 1072 to 1092, presided over a powerful empire. His minister Nizam al-Mulk supported administration and Sunni religious institutions. Yet the dynasty's broad reach left regional princes and commanders with substantial autonomy. The Anatolian Sultanate of Rum developed separately from the Great Seljuk centre. 'Seljuk' could therefore describe connected but competing powers.
Expansion did not produce lasting unity
Muslim expansion made the eleventh-century Near East formidable, but succession disputes made coordinated action difficult. Malik Shah's death in 1092 was followed by struggles over his empire. In Syria, competition divided authority among regional rulers; after Tutush's death in 1095, his sons Ridwan in Aleppo and Duqaq in Damascus pursued separate interests. A rival ruler's defeat might remove a threat even if the victor was a Latin army.
This distinction explains an apparent paradox. In 1071 a Muslim ruler could defeat a Byzantine emperor; in 1097–99 different Muslim rulers could fail to unite effectively against the First Crusade. Military strength had not disappeared. It was distributed among competing centres, and rivalries affected when and how it could be used. The Fatimids' recovery of Jerusalem from Turkish rulers in 1098 also shows that Muslim conflict continued during the crusaders' advance.
Faith remained significant. Jihad could include striving in God's service and, in legal and political contexts, armed defence or expansion. However, the existence of an idea did not automatically supply a common commander or army. The later growth of an organised counter-crusading movement must be explained as a development, not assumed to have existed fully formed in 1071.