The author is a leading writer on Islamic and Iranian history and Director of the Library of Islamic and Iranian History in Qum.
In the Name of Allah, the All-beneficent, the All-merciful
The domination of the Sunnī creed during the first nine Islamic centuries characterizes the religious history of Iran during this period. There were however some exceptions to this general domination which emerged in the form of the Zaydīs of Tabaristan, the Buwayhids, the rule of Sultan Muhammad Khudabandah (r. Shawwal 703-Shawwal 716/1304-1316) and the Sarbedarīs. Nevertheless, apart from this domination there existed, firstly, throughout these nine centuries, Shī‘ī inclinations among many Sunnīs of this land and, secondly, original Imamī Shī‘ism as well as Zaydī Shī‘ism had prevalence in some parts of Iran.
During this period, Imamī and Zaydī Shī‘ism in Iran were nourished from Kufah, Baghdad and, later, from Najaf and Hillah. The character of these links is a topic which requires study. Identification of the channels of this nourishment and its duration and phases will assist us in the study of Shī‘ī ideas and their prevalence in Iran.
The connection between Iraqī Shī‘ism and Iran has existed continuously from the beginning until the present time. However, during the first nine centuries there are four high points in the history of this linkage:
From a historical point of view there does not exist much vagueness concerning the first and the fourth phases. But the second and the third phases stand in need of further study. During the fifth/eleventh and sixth/twelfth centuries, a large number of Shī‘ī scholars from the central (Ray and Qum), northern (Amul and Sarī) and north-eastern (Bayhaq and Nayshabur) parts of Iran brought Shī‘ism to Iran following their sojourns in Iraq and the cities of Baghdad and Najaf. Some of them were pupils of Shaykh Mufīd (d. 413/1022) and Sharīf Murtada (d. 436/1045) and many were pupils of Shaykh Tusī (d. 460/1068) and his son, Abu ‘Ali (alive in 511/1117), and other teachers of the Shī‘ī centre of Najaf.
For another time in the eighth/fourteenth century we are witness to the migration of a large number of Shī‘ī scholars of Iranian origin from the above-mentioned regions to Hillah. Many of them were pupils of ‘Allamah Hillī (d. 726/1326) and his son, Fakhr al-Muhaqqiqīn (d. 771/1369), and they brought the works of these two Shī‘ī scholars to Iran and translated some of them into Persian. This period of growth of Shī‘ism in Iran is in marked contrast to the state of stagnation of Sunnī thought in Iran in the aftermath of the fall of Baghdad, and during it we do not come across any vigorous work in Sunnī kalam and fiqh in Iran. Rather, we witness the development of Sunnī tasawwuf followed by Shī‘ī ‘irfan.
Among the most important effects of this intellectual nourishment was the control of Iranian Shī‘ism by Arab Shī‘ism, with the result that during this period we do not find anything that may be termed as ‘Iranian Shī‘ism’ with characteristics independent of Arab Shī‘ism. Possibly some of the features of Iranian Shī‘ism, such as the festival of Nowruz, became more prominent than they were ever in Iraq, but the foundation and essence of Iranian Shī‘ism is nothing but Arab Shī‘ism. The present article is devoted to describing the second and third phases of this influence.
The Shī‘ī academic centre of Baghdad benefited from two sources. First was the Shī‘ī hadīth tradition, which was mainly drawn from Iran (Qum and Ray), and besides the works of Shaykh Saduq other works were hardly any significant. The second source was the rationalist Shī‘ī school which had roots in Kufah and Baghdad itself. The Shī‘ī school of Baghdad drew its strength from what it had drawn from Kufah and Qum, especially from the time when the Buwayhids came to rule in Baghdad. After the Seljuqs came to power there during the first half of the fifth\eleventh century, the Shī‘ī school of Baghdad declined and the ensuing Shī‘ī-Sunnī disturbances led to the migration of some Shī‘ī scholars. The real pillars of this school were Shaykh Mufīd (d. 413/1022) and Sayyid Murtada (d. 436/1044) and, after them, Shaykh Tusī. Each of these three played a basic role in the reconstruction of the intellectual foundations on which the Shī‘ah tradition of the later periods was built.
Shaykh Tusī (Abu Ja‘far Muhammad ibn al-Hasan ibn ‘Ali Ibn al-Hasan al-Tusī) was born at Tus in Ramadan of the year 385/995. After studying some of the texts in his native town or at Nayshabur he set out for Baghdad in the year 408/1017. There, he was a pupil of Shaykh Mufīd until the year 413/1022 and thereafter that of Sharīf Murtada until 436/1044. After Sharīf Murtada, he assumed the leadership of the Shī‘ī community until, during the Shī‘ī-Sunni riots and disturbances, his house and library were set on fire and these events compelled him to set out for Najaf in the year 448/1056. He had the good fortune to transform the small and limited academic circle of this city during the rest of his life, until 460/1067, into a major centre of learning. After him his son and disciple, Abu ‘Ali (alive in 511/1117), pursued the work of his father. During that time a large number of Shī‘ī scholars of Arab and Iranian origin had gathered at Baghdad and Najaf. Scholars like Sallar ibn ‘Abd al-Azīz Daylamī, Ibn Barraj and Karjajakī were scholars of the second rank after Mufīd, Sharīf Murtada and Shaykh Tusī.
The academic fame of Najaf with its religious uniformity under the leadership of Shaykh Tusī and that too by the side of the shrine of Amīr al-Mu’minīn ‘Ali (‘a) drew many students from Shī‘ī towns of Syria and Iran and strengthened this academic centre. Ibn al-Futī writes that in his age the learned station of Shaykh Tusī was universally acknowledged and students came from all towns to study under him.
Shaykh Tusī was the product of the academic efforts of the traditionalist and rationalist Shī‘ī schools of Iran (Qum and Ray) and Baghdad. He had studied under the most outstanding of Shī‘ī teachers such as Shaykh Mufīd and Sharīf Murtada. He had begun the writing of his book Tahdhīb in the lifetime of Shaykh Mufīd itself and he wrote some of the best Shī‘ī works in the fields of hadīth, fiqh, tafsīr, kalam and rijal, and abridged moreover some of the best existing works, such as Kashshī’s Rijal and Sharīf Murtada’s al-Shafī. Such a remarkable achievement was on the one hand the product of the efforts of his predecessors and, on the other, it became the cause of the spread of Shī‘ī thought in the subsequent periods.
That which is of interest to us in this study is the spread of the ideas of the Shaykh in Iran. In fact, we may conceive of the Shī‘ī world of the time as a bird whose body was represented by Iraq with Halab and Ray as its wings. Here we will try to trace the influence of Shaykh Tusī on Shī‘ism in Iran.
 It appears that he was in Nayshabur all this time or for part of it, as he himself mentions that he had studied the book Bayan al-Dīn under Abu Hazim Nayshaburī, and this was at Nayshabur. See Tabataba’ī, ‘Abd al-‘Azīz, ‘‘Shakhsiyyat-e ‘ilmī wa mashayikh-e Shaykh Tusī,’’ Mīrath-e Islamī-ye Iran, daftar 2 (Qum: Kitabkhaneh Ayatullah al-‘Uzma Mar‘ashī, 1374 H. Sh.), p. 378.
 Hasan ‘Isa al-Hakīm, Al-Shaykh al-Tusī, Abu Ja‘far Muhammad ibn al-Hasan (385-460) (Baghdad, 1975), pp. 78-78.
 Ibid., pp. 98-101.
 Ibn al-Futī, Talkhīs Majma‘ al-Adab (Damascus: Wizarat al-Thiqafah wa al-Irshad al-Qawmī, 1382), ed. Mustafa Jawad, part 2, p. 815.