Sanjar-Shah succeeded his father Toghan-Shah after the latter's death in either 1185 or 1186, although his atabeg Mengli Beg held actual power. In 1186 the Khwarezmshah Tekish, having been informed on the instability in Khurasan, led an army south in 1186 and laid siege to Shadyakh, where Sanjar-Shah and Mengli Beg were residing (Shadyakh was a suburb of Nishapur, which had been Sanjar-Shah's father's capital, but which had been heavily damaged by Ghuzz raids). A second siege by Tekish's army in 1187 ended with the capture of Shadyakh and both Sanjar-Shah and his atabeg. Mengli Beg was executed, while Sanjar-Shah was carried off to Khwarezm; the government of Nishapur was given over to Tekish's son Malik-Shah. Despite this, Sanjar-Shah continued to collude with anti-Khwarezmid elements in Nishapur; in retaliation the shah ordered his blinding.
- Bosworth, p. 190
- Mengli Beg is also named as Mengli-Tegin. Bosworth, p. 190
- Bosworth, C.E. "The Political and Dynastic History of the Iranian World (A.D. 1000-1217)." The Cambridge History of Iran, Volume 5: The Saljuq and Mongol Periods. Edited by J.A. Boyle. Great Britain: Cambridge University Press, 1968. ISBN 978-0-521-06936-6
|Amir of Nishapur
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