Gaznalys reign was at its most powerful. The Gaznalys and Gurs also inter-married. However, Kutbettin Muhammed of the Gurs killed his own father-in-law at the behest of the Gaznalys. Upon this, Suri’s brother conquered Gazna in 1148 to take revenge for what happened. A year later Behram Shah recaptured the city and tortured Seyfettin Suri to death. This ruthless act perpetrated for the second time against their family strengtheed the will for revenge in Aleaddin Huseyin, the brother of Seyfetin Suri. Aleaddin attacked Gazna, set fire to it and put all to death by the sword. For this reason he is known as, “the man who set the world on fire.” He left Gazna in ruins in utter disgust and hatred for Gur. Aleaddin died in Gur in 1161 shortly after he was taken captive by the Seljuks Soltan Sanjar. Around this time, the Turkmens-Guzs (Oguzs) took Afghanistan and eventually destroyed the states of Gur and Gazna.