Urged on by Caliph al-Nasir, the Ghurids defeated the Kara Kitans at Guzgan and then Sultan Tekish of Khwarazm at Herat in decisive battles. Ghiyath al-Din followed up his victories by overrunning the rest of Khurasan in 1200, after the death of Sultan Tekish. Ghiyath al-Din died in 1203, leaving his brother Muhammad the sole ruler of the realm. More @Wikipedia
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