Al-Juwayni is an eleventh-century Islamic scholar who studied kalam, fiqh, tafsir, and hadith sciences. This book is a translation of his al-Aqidah al-Nizamiyyah, written as a gift to Nizam al-Mulk, scholar and famous vizier of the Seljuk Empire. In this book, Al-Juwayni, who walked between the Ash and Salafi sects, explains Ash'ari doctrines on controversial theological issues.