Ibn Qarnas's seminal work, "A Treatise on the Caliphate and God's Rule," offers a profound exploration into the theological and jurisprudential foundations of Islamic governance. This book meticulously examines the concept of the Caliphate, asserting the necessity of aligning state authority with divine law to ensure justice and societal well-being. Qarnas delves into the historical precedents and theoretical frameworks that shape the responsibilities of rulers and the rights of the populace within an Islamic framework. It remains an indispensable resource for understanding classical Islamic political thought and its enduring relevance to contemporary discussions on leadership and divine sovereignty.