History of the Great Seljuk Empire

The Great Seljuk Empire emerged in the eleventh century from the conquests of a ruling family from the Turkic Oghuz people. Victory over the Ghaznavids at Dandanakan in 1040 gave its leaders a secure base in Khorasan. Within fifteen years, Tughril had entered Baghdad and established a new relationship between a powerful ruler titled sultan and the Abbasid caliph, the political and religious leader of the Muslim community.

The empire joined military followings to the resources of existing cities and agricultural districts. Persian-speaking officials administered much of its government, while the dynasty maintained claims across territories often governed by relatives or military commanders. The senior sultan’s authority depended on their cooperation as well as on victory in battle.

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Oghuz origins and the conquest of Khorasan

The family took its name from Seljuk, an Oghuz leader associated with the region around Jand near the lower Syr Darya. His descendants entered the Muslim political world of Central Asia and eastern Iran through migration, alliances and military service. Their followers required pasture and supplies as well as opportunities for advancement.

The Ghaznavids sought to contain these groups in Khorasan. In 1040, forces led by Tughril and his brother Chaghri defeated the army of the Ghaznavid ruler Masud at Dandanakan, near Merv. The defeat weakened Ghaznavid power in the region and enabled the Seljuks to secure major centres.

Chaghri remained closely associated with the eastern lands, while Tughril expanded westward across Iran. The division of responsibilities within the family helped manage conquest but also established the importance of territorial commands held by dynastic relatives.

Tughril and the Abbasid caliph

Tughril captured Isfahan in 1050 after a siege and made it an important centre of his power. In 1055 he entered Baghdad, ending Buyid control there. The Abbasid caliph retained his religious and ceremonial position, while Seljuk military strength became the decisive outside force in the city.

This arrangement gave each side something it needed. Caliphal recognition reinforced the sultan’s legitimacy within Sunni Islam; the caliph gained protection against rivals. Their relationship nevertheless involved bargaining and tension over appointments, resources and the limits of interference.

Tughril’s power faced challenges within his own wider family and following. Ibrahim Inal’s rebellion and the temporary occupation of Baghdad by al-Basasiri showed that military success did not remove the need to manage competing commanders. Tughril re-established his position before his death in 1063.

Alp Arslan and the western campaigns

Alp Arslan, Chaghri’s son, emerged as sultan after the succession struggle that followed Tughril’s death. His vizier Nizam al-Mulk became a central figure in government, helping connect the court with experienced administrative networks.

Campaigns extended Seljuk power into the Caucasus and eastern Anatolia. Ani fell in 1064. In 1071, Alp Arslan defeated the Byzantine emperor Romanos IV at Manzikert and took him prisoner. Romanos was released after negotiations, but the subsequent struggles within Byzantium weakened the empire’s ability to contain further incursions.

Manzikert did not instantly place all Anatolia under a single Seljuk administration. Different Turkish commanders and dynasties established power in the following decades. The Great Seljuk sultan’s campaigns and the formation of the Sultanate of Rum were connected developments with distinct political histories.

Malik Shah’s reign and its resources

Malik Shah succeeded his father in 1072 and ruled until 1092. With Nizam al-Mulk as vizier, he presided over extensive territories and a court able to support major building and scholarly projects. Revenue from agricultural districts and towns sustained military households, officials and patronage.

The allocation of revenue through iqta grants, assignments of district revenue tied to service, helped support the army without requiring every payment to pass through a central treasury. Such arrangements also gave powerful recipients a stake in particular districts. Appointing governors and managing princes remained essential to the sultan’s position.

Religious foundations, including the Nizamiyya colleges, expanded during this period. At Isfahan, major work on the congregational mosque demonstrated competing forms of elite patronage. Court support also brought astronomers together for the calendar work associated with Malik Shah.

Succession wars after 1092

Nizam al-Mulk and Malik Shah died in 1092. Rival claims then divided the dynasty and its military supporters. Malik Shah’s young son Mahmud was promoted by his mother Terken Khatun, while Berkyaruq secured a competing claim. Later struggles involved Muhammad Tapar and other relatives.

These conflicts consumed resources and allowed regional commanders greater room to act. Tutush, Malik Shah’s brother, established power in Syria before his death in 1095; his sons held rival positions in Aleppo and Damascus. Atabegs, originally associated with the guardianship of princes, could turn their authority and military followings into durable regional power.

The First Crusade reached the eastern Mediterranean within this divided political landscape. Muslim opponents of the crusaders belonged to different ruling houses and competing centres, rather than answering consistently to one Seljuk command.

Sanjar and the end of the eastern empire

Sanjar governed Khorasan from the late eleventh century and became the senior dynastic ruler in 1118. His court at Merv maintained an influential eastern centre, while Seljuk sultans in Iraq and western Iran operated within a related but distinct political sphere.

In 1141, Sanjar suffered defeat by the Qara Khitai at Qatwan near Samarkand. In 1153, Oghuz rebels captured him, and the ensuing disorder badly damaged his authority in Khorasan. He escaped captivity but could not restore the earlier position before his death in 1157.

The western line continued for several decades. In 1194, the Khwarazmian ruler Tekish defeated and killed Tughril III, ending the rule of the Iraqi Seljuk sultans. Seljuk dynastic government survived longer in Anatolia, while many institutions and artistic practices associated with the wider Seljuk world continued under other patrons.