Kitab al-Siyar al-Kabir is a monumental work by the renowned Hanafi scholar Muhammad ibn al-Hasan al-Shaybani, considered one of the foundational texts of Islamic international law. This extensive commentary unpacks al-Shaybani's profound insights into the rules governing relations between Muslim and non-Muslim states in times of war and peace, diplomacy, treaties, and the treatment of combatants and civilians. It delves into the jurisprudential principles that shaped early Islamic foreign policy and continues to offer crucial perspectives on contemporary international relations from an Islamic perspective. The work is meticulously annotated, making complex legal arguments accessible.