Sabbah's reign, more than half were Seljuk officials, many of whom supported Muhammad I Tapar. The story (presented here) claiming a friendship among Nizam al-Mulk, Hassan-i Sabbah and Omar Khayyam described by Edward FitzGerald in his translation of The Rubaiyat of Omar Khayyam is most certainly false. The Assassins seized Persian castles of Rudkhan and Gerdkuh in 1096, before turning to Syria. Gerdkuh was re-fortified by Mu'ayyad al-Din Muzaffar ibn Ahmad Mustawfi, a Seljuk who was a secret Isma'ili convert, and his son Sharaf al-Din Muhammad. There they occupied the fortress at Shaizar held by the Banu Munqidh, using it to spread terror to Isfahan, the heart of the Seljuk Empire. A rebellion by the local population drove the Assassins out, but they continued to occupy a smaller fortress at Khalinjan. In 1097, Barkiyaruq associate Bursuq was killed by Assassins. By 1100, Barkiyaruq had consolidated his power, and the Assassins increased their presence by infiltrating the sultan's court and army. Day-to-day functions of the court were frequently performed while armored and with weapons. The next year, he tasked his brother Ahmad Sanjar, then ruler of Khorasan, to attack Assassin strongholds in Quhistan. The siege at Tabas was at first successful, with the walls of the fortress breached, but then was lifted, possibly because the Seljuk commander had been bribed. The subsequent attack was devastating to the Assassins, but the terms granted were generous and they were soon reestablished at both Quhistan and Tabas. In the years following, the Assassins continued their mission against religious and secular leaders. Given these successes, they began expanding their operations into Syria. Expansion into Syria The first da'i Hassan-i dispatched to Syria was al-Hakim al-Munajjim, a Persian known as the physician-astrologer, establishing a cell in Aleppo in the early 12th century. Ridwan, the emir of Aleppo, was in search of allies and worked closely with al-Hakim leading to speculation that Ridwan himself was a Nizari. The alliance was first shown in the assassination in 1103 of Janah ad-Dawla, emir of Homs and a key opponent of Ridwan. He was murdered by three Assassins at the Great Mosque of al-Nuri in Homs. Al-Hakim died a few weeks later and was succeeded by Abu Tahir al-Sa’igh, a Persian known as the goldsmith. After the death of Barkiyaruq in 1105, his successor Muhammad I Tapar began his anti-Nizari campaign. While successful in cleaning the Assassins out of parts