The promotion of modern scholarship on the IsmailisAdherents of a branch of Shi’i Islam that considers Ismail, the eldest son of the Shi’i Imam Jaʿfar al-Ṣādiq (d. 765), as his successor. and their intellectual and cultural heritage is an important part of the Institute’s mandate. The publications arising from research in this field of Islamic studies now appear under the special imprints of the Ismaili Heritage Series and the Ismaili Texts and Translations Series.
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Epistles of the Brethren of Purity
The Epistles of the Brethren of Purity is published by Oxford University Press in association with the IIS. This bilingual series consists of a multi-authored Arabic critical edition and annotated English translation of the Rasa’il Ikhwan al-Safa’ (ca. tenth-century Iraq).

Encyclopaedia Islamica
Encyclopaedia Islamica Online is based on the abridged and edited translation of the Persian Dāʾirat al-Maʿārif-i Buzurg-i Islāmī, one of the most comprehensive sources on Islam and the Muslim world. A unique feature of the Encyclopaedia Islamica Online lies in the attention given to Shiʿi Islam and its rich and diverse heritage.

World of Islam
This series provides a concise, reliable, and accessible overview of the diverse manifestations of Islam. It seeks to offer a nuanced survey of the plurality of interpretations amongst Muslims around the world, and through history, and to stimulate readers to think differently about Islam.

Living Ismaili Traditions
The Living Ismaili Traditions series aims to inform and inspire an Ismaili readership with a balanced and inclusive understanding of topics pertinent to the Jamat. Written for members of the Ismaili community, this unique series explores the shared and diverse histories, identities, beliefs and practices of the Jamat worldwide.