Iraq in the tenth and eleventh centuries witnessed a
flowering of Shiite cultural production with lasting
effects on the Islamic sciences such as law, hadith,
theology, and Qur'anic commentary. The works of
al-Shaykh al-Mufīd (d. 413/1022), al-Sharīf
al-Murtaḍā (d. 436/1044), and al-Shaykh al-Ṭūsī (d.
460/1067) not only broke significant new ground in
Shiite intellectual history and defended Shiite
doctrinal positions against opponents, but also set
parameters for production in these fields that would
remain in effect, grosso modo,
until modern times. During the same period, Shiite
authors made substantial contributions to fields not
directly related to Shiite religious doctrine,
playing a crucial role in elaborating and preserving
Islamic heritage in general. Al-Masʿūdī's (d.
345/956) famous history Murūj
al-dhahab and Abū al-Faraj al-Iṣfahānī's
(d. 356/967) collection of songs, poetry, and
associated lore, Kitāb al-Aghānī,
are prominent examples of Shiite authors'
contributions to general Arabo-Islamic cultural
production. Arguably yet more important is the
Fihrist, composed in Baghdad in
377-378 ah/987-988 ce by Ibn
al-Nadīm, an Imāmī Shiite bookseller. This work, a
comprehensive catalogue of Arabic book titles, is
widely recognised as one of the most important
sources for the history of all learned disciplines
recorded in Arabic in the course of the first four
Islamic centuries. As a consequence, the present
understanding of entire swaths of Islamic
intellectual history, including the rise and
development of Muʿtazilī theology and the
translation of the Greek sciences into Arabic, is
heavily indebted to a Shiite author.