The city's good fortune came to an unexpected and ruthless end when it was sacked and set on fire in 1151 by the Ghurid Sultan Ala al-Din Husayn (r. 1149-1161). All the tombs of the Ghaznavid rulers, with the exception of Mahmud, Mas'ud I and Ibrahim, were broken open and the remains burned. From these events, Ala ad-Din Husayn gained the nickname, ''Jahānsūz'' (meaning the ''World Burner'').