 In the same year, Möngke Khan, the khagan of the Mongol Empire, ordered a massacre of all Nizari Ismailis of Persia.Rukn al-Din Khurshah himself, who had traveled to the mainland Mongolia to meet Möngke Khan, was killed by his personal Mongol guard there.Gerdkuh castle finally fell in 1270, becoming the last Nizari stronghold in Persia to be conquered.