Griffithes Wheeler Thatcher, 1911 Encyclopedia Britannica (1911)
“ The Assassins soon began to make their power felt. One of their first victims was Hassan’s former friend, Nizam-ul-Mulk, whose son also died under the dagger of a secret murderer. The death by poison of the sultan Malik-Shah was likewise ascribed to this dreaded society, and contributed to increase their evil fame. Sultan Sinjar, his successor, made war upon them, but he was soon glad to come to terms with enemies against whose operations no precaution seemed available. After a long and prosperous rule Hassan died at an advanced age in 1124. ”
