The Ahmed Sanjar reference article from the English Wikipedia on 24-Apr-2004
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Ahmed Sanjar

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Mu'izz ad-Din Ahmed Sanjar (1084 (or 1086) - May 8 1157) was the sultan of Great Seljuk from 1118 to 1153. He was a son of Malik Shah I and participated in the succesion wars against his three brothers and one uncle. From 1097, Ahmed Sanjar was the ruler of Khorasan. He was captured by Turkmen nomads in 1153 and was held captive until 1156. He died the following year.