'Mu'iz ud-Dīn Ahmad-e Sanjar' (
Turkish: ''Sultan Sencer'') (1084/1086 –
May 8 1157) was the
sultan of
Great Seljuk from 1118 to
1153. He was initially the sultan of
Khorasan until he gained the rest of the territory after
Muhammad I's death.
He was a son of
Malik Shah I and participated in the succession wars against his three brothers and one uncle, namely
Mahmud I,
Barkiyaruq,
Malik Shah II and
Muhammad I. From
1097, Ahmed Sanjar was the ruler of most of
Persia, his capital being situated in
Nishapur. A number of rulers revolted against him and the Great Seljuk Empire split.
Ahmed Sanjar was captured by
Turkmen nomads in 1153 and was held captive until
1156. He died the following year.