During the last half of the eleventh century one of the Ismaelite missionaries, Hassan ibn Subáh el Homáirí, became the founder of the new sect of the Ismaelites of the East, or Assassins. Hassan was born in Khorassan; in his youth he contracted an intimate friendship with Nizám el Mulk and ‘Omar el Kheiyám, and the three associates took a solemn oath mutually to advance each other’s prospects in after life. ‘Omar el Kheiyám became celebrated as an astronomer and poet;[65] and Nizám el Mulk attained to the office of grand vizier, under the Seljukian Sultán Melik sháh. Hassán es Subah sought and obtained the assistance of his former companion, and was promoted to high office in the court. Prompted, however, by ambition, he endeavoured to supplant his benefactor, but Nizám el Mulk discovered and counteracted his designs, and Hassan was driven in disgrace from the kings presence. Not long afterwards he founded the order of Assassins, and Melik Sháh and his vizier were among the first of his victims. In 1090, he made himself master of the fortress of Alamút, built on the summit of a lofty mountain, with steep escarpments, a little distance from Casbín in the Persian province of ‘Irák. This castle he fortified and supplied with water, partly from artificial and partly from natural springs, and, by compelling the inhabitants to cultivate the surrounding land and store the produce in the subterranean granaries of the castle, he rendered it capable of sustaining a protracted siege. Footnote 65: His ‘Quatrains,’ stanzas of exquisite polish, but breathing the most sensual and atheistic philosophy, have been recently published by M. Nicholas, Paris, 1867. Although the secret doctrines of the Ismaelites were taught in nine degrees, there were but two ranks in the order, namely the _refik_, or “companion,” and _dá‘í_, or “missionary.” Hassan instituted a third class, that of the _fedawí_, or “devoted one.” For them the secrets of the order were always covered with an impenetrable veil, and they were but the blind instruments of vengeance or aggression in the hands of their superior. They composed the body-guard of the grand master, and were never for a single moment without their daggers, so as to be ever ready to perpetrate murders at his command.