In 624/1227, Chenghiz Khan conquered eastern region of Iran, but the Ismailis of Kohistan were unaffected by the initial phase of the operations and continued to enjoy their prosperity. On that juncture, an increasing number of the Sunni Muslim refugees, including numerous ulema of Khorasan, had ferruled asylum in the Ismaili towns of Kohistan. The Ismailis welcomed the flood of the refugees, and assisted them with their own resources. In Kohistan, the Ismailis maintained an island of prosperity and stability from which all benefited. The visiting Sunni jurist and historian, Minhaj Siraj Juzjani (d. 685/1286), who spent his earlier years in the services of the Ghorid dynasty in India. He visited Kohistan three times between 621/1224 and 623/1226. He writes in his 'Tabaqat-i Nasiri' (comp. 658/1260) that Shihabuddin bin Mansur Abul Fateh, the learned Ismaili governor of Kohistan was lavish in his treatment to these Sunni refugees in his mountain fastnesses. He further writes in 'Tabaqat-i Nasiri' (tr. by Ghulam Rasul Maher, Lahore, 1975, 2nd vol., pp. 230-31) that, 'I found him a person of infinite learning with wisdom, science, and philosophy, in such wise, that a philosopher and sage like unto him there was not in the territory of Khorasan. He used greatly to cherish poor strangers and travellers; and such Muslims of Khorasan as had come into proximity with him he was wont to take under his guardianship and protection. On this account his assemblies contained some of the most distinguished of the ulema of Khorasan; and he had treated all of them with honour and reverence, and showed them much kindness. They stated to this effect, that, during those first two or three years of anarchy in Khorasan, one thousand honorary dresses, and seven hundred horses, with trappings, had been received from his treasury and stables by ulema and poor strangers.'
It is however recounted that the local Ismailis of Kohistan lodged complaints to Alamut about the negative effects of the generous hospitality from the state treasury. Thus, Shihabuddin was summoned at Alamut, and a new governor, Shamsuddin Hussain Ikhtiyar was appointed instead. The latter also came to be equally admired by the Muslim refugees because of the similar lavish treatment, which evidently implies that the principal cause of the replacement was not the lavish treatment, but was summoned for some other task. Shihabuddin himself was also a learned scholar, and his one scribe in Kohistan, called Ra'is al-Hasan bin Saleh Munshi Birjandi, had compiled the Ismaili history which was used by Rashiduddin in 'Jamiut Tawarikh.'
Ismaili History 635 - War with Sistan
The arrival of Shamsuddin Hasan at Kohistan marked with the outbreak of new conflicts between the Ismailis and their Sistan neighbours. Yaminuddin Bahram Shah bin Taj al-Din Harb (610-618/1213-1221), the local Nasrid chief of Sistan, had previously waged two wars against Alamut during the time of Imam Jalaluddin Hasan; and his nephew had sold the fortress of Shahanshah near the town of Nih to Alamut. Yaminuddin demanded from the Ismailis of Kohistan to give up the claim of the fortress, and threatened to capture it by force. Before the invasion of Yaminuddin on Kohistan, the four fidais had killed him on 5th Rabi II, 618/May 29, 1221 at Zarang.
It was followed immediately by the succession issue in Sistan among the sons of Yaminuddin. The Ismailis of Kohistan supported Ruknuddin against his younger brother Nusratuddin, whom the notables placed on the throne. Like his father, Nusratuddin continued his claim on the fortress of Shahanshah. Soon afterwards, Ruknuddin gained the throne of Sistan with the help of the Ismailis in 619/1222. In the meantime, the Mongols invaded Sistan without staying there, and Ruknuddin had also been killed by his slave. The notables of Sistan put on the throne Shihabuddin bin Harb and his brother Ali, to the dissatisfaction of the Ismailis, who again had their own candidate, Uthman Shah bin Nasiruddin Uthman. They acquired support from Khwarazmian commander, called Tajuddin Yinaltagin, who was then stationed at Kirman, for the rights of Uthman. Yinaltagin arrived in 622/1225 at Sistan with his troops, and defeated the forces of Sistan. Instead of placing Uthman on the throne, Yinaltagin retained this power with him for almost a decade.
Thus, Shamsuddin, the Ismaili governor of Kohistan commanded his forces in a battle against Yinaltagin, and inflicted a defeat to him in 623/1226. It was after this battle against Yinaltagin, who deputed Minhaj Siraj Juzjani as his envoy to conduct diplomatic negotiations with the Ismailis of Kohistan. Minhaj Siraj concluded a truce with Shamsuddin at Nih on behalf of Yinaltagin, and as a result, the Ismailis pursued an independent policy in its local affairs, and developed important trade route with other regions, which were the source of acceleration of their economical conditions. When Minhaj Siraj returned to Sistan after negotiations, Yinaltagin forced him to go once again to Kohistan to declare a war against the Ismailis, but he did not consent to set out on a second journey, as he had determined upon undertaking a journey into India. This refusal did not meet with the approval of Yinaltagin and he commanded to detain him for 43 days in the fort of Safhad of Sistan and prohibited his going beyond the walls.
In the meantime, Alamut gave refuge to Ozbeg's son, Malik Khamush, and to Jalaluddin's brother Ghiasuddin, who were dismissed from their posts by the Khwarazmshah in 625/1228. The Ismailis helped Ghiasuddin despite the Khawarazmian blockade of Rudhbar, but he was there murdered.
In 625/1228, while the Ismaili envoy Badruddin was travelling east across the Oxus to Mongol court, Jalaluddin Khwarazmshah ordered at once to stop all the caravans in that direction, pretending that a Mongol envoy was on his way to Syria in the company of some Ismailis. In compliance, his vizir Sharaf al-Mulk put to death in Azerbaijan a westward Syrian Ismaili caravan of seventy merchants. Hence, Alamut sent an emissary to the Khwarazmshah, demanding successfully retrieval of the goods taken from the murdered Syrian Ismailis. In the meantime, Ghiasuddin took flight from Alamut which had enraged Jalaluddin Khwarazmshah.
Ismaili History 636 - Nasiruddin Tusi
Nasiruddin Tusi was born in Tus, Khorasan in 597/1202. In his youth, about in 624/1227, he entered the service of Nasiruddin Abdu Rahman bin Abu Mansur (d. 655/1257), the Ismaili governor in Kohistan. During his long stay at Qain and other strongholds in Kohistan, Nasiruddin Tusi procured his close friendship with the Ismaili governor, to whom he also dedicated in 633/1235 his famous work on ethics, entitled 'Akhlaq-i Nasiri'. He went to Alamut and espoused Ismaili faith. In his 'Sayr wa Suluk' (pp. 38-42), he narrates how, after his initial dissatisfaction with scholastic theology and philosophy, he came to realize the necessity of following an infallible Imam who would guide reason to its perfection. In all probability, Nasiruddin Tusi willingly embraced Ismailism during the time of Imam Alauddin Muhammad. According to Farhad Daftary in his 'The Ismailis: their History and Doctrines' (London, 1990, p. 408), 'There is no evidence suggesting that these outside scholars were detained in the community against their will or that they were forced to embrace Ismailism during their stay amongst the Nizaris.' He enjoyed the patronage of Alauddin Muhammad and his successor, until the collapse of the Alamut rule in 654/1256. The Mongol chief Halagu made him his trusted advisor, and built a great observatory for him at Maragha in Azerbaijan. He was a most voluminous writer too, and died in 672/1274. His 'Rawdatu't-Taslim' and other short treatises bear an Ismaili imprint. Seyyed Hossein Nasr writes in 'Science and Civilization in Islam' (Mass., 1968, p. 322) that, 'The universality of Nasir al-Din's genius, which some have quite erroneously taken for lack of principles, is shown by the fact that, while in the service of the Ismailis, he was able to master their doctrines and even wrote several works which contain some of the clearest expositions of Ismailism. Among these, the 'Rawdat al-taslim' is particularly notable, as a simple exposition of the basic doctrines of this important branch of Islam.'
