This book is a Turkish translation of the eleventh-century Islamic scholar Imam al-Haramayn Abd al-Malik ibn Yusuf, also known as al-Juwayni. His last book, al-Aqidah al-Nizamiyyah, was a gift to Nizam al-Mulk, the famous Selchukid vizier and scholar. This book is a translation of this work, and it is about foundational issues of the science of kalam, such as belief in God, the existence of God, the institution of Prophethood, the afterlife, and similar subjects.