Seljuk Empire
Malik Shah I

Under Alp Arslan 's successor, Malik Shah, and his two Persian viziers, Nizām al-Mulk and Tāj al-Mulk, the Seljuk state expanded in various directions, to the former Iranian border of the days before the Arab invasion, so that it soon bordered China in the east and the Byzantines in the west. Malik Shah's brother Tutush defended Seljuk' interests in Syria in the battle of Ain Salm against Suleiman ibn Qutalmish who had started to carve out an independent state in Anatolia. Nevertheless, despite various attempts to bring afterwards the various Turkish warlords in Anatolia under control, they largerly maintained their independence. Malikshāh was the one who moved the capital from Ray to Isfahan. The Iqta military system and the Nizāmīyyah University at Baghdad were established by Nizām al-Mulk, and the reign of Malikshāh was reckoned the golden age of "Great Seljuk". The Abbasid caliph titled him "The Sultan of the East and West" in 1087.

Internally, the most prominent development of Malik Shah's rule was the continuous increase in the power of the Nizām al-Mulk. Some contemporary chroniclers refer to the period as "al-dawla al-Nizamiyya", the Nizam's state, while modern scholars have mentioned him as "the real ruler of the Seljuq empire". The 14-century biographer Subki claimed that Nizām al-Mulk's vizierate was "not just a vizierate, it was above the sultanate". The Assassins (Hashshashin) of Hassan-i Sabāh started to become a force during his era, however, and they assassinated many leading figures in his administration; according to many sources these victims included Nizām al-Mulk.
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