Book excerpt: With the execution of the Abbasid caliph in Al-Musta'sim in 1258, Sunni authority and legitimacy in Baghdad began to disintegrate, and the recently established Delhi Sultanate became a new focus for the development of Muslim societies amidst a global shift in Islamic authority. Here Blain Auer investigates the ways three historians living in India during the thirteenth and fourteenth centuries, Minhaj Siraj Juzjani, Ziya' al-Din Barani and al-Din Siraj 'Afif, narrated the religious values of Muslim sovereigns through the process of history writing. Aiding the project of empire building, these historians and intellectuals drew up an idea of an Islamic heritage that invented and reinterpreted conceptions of a historically rooted Muslim authority. With fresh insights on the intersections between religion, politics and historiography, this book will be indispensable for all those interested in Islamic studies, history, religion, politics and South Asia.