Abu'l Husain Nasr [1] known by his title Ilig Khan, also Ilig Khan Nasr (died 1012), was a ruler of the Kara-Khanids. He was a son of Ali Arslan Khan.
Ilig Khan conquered Bukhara from the Samanids in 999, bringing an end to that rival dynasty. [2] He then reached an agreement with Mahmud of Ghazni, in which they agreed to partition former Samanid territory along the Oxus river. [2] [3] With this agreement, the north-eastern lands of Islam came under the power of two Turkish Empires, the Kara-Khanids and the Ghaznavids, paving the way for Turkish immigration from Inner Central Asia. [2] He died in 1012-1013 and was succeeded by his brother Ahmad Tughan Khan. [4]
An agreement was reached at this point with the Karakhanid Ilig Nasr b. Ali making the Oxus the boundary between the two empires [the Karakhanids and the Ghaznavids], for the shrunken Samanid amirate came to an inglorious end when the Ilig occupied Bukhara definitively in 999
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