Kitab al-Iklil, also known as "The Book of the Crown," is a significant work of Arabic literature written by the renowned historian and geographer Ibn al-Athir in the 12th century. This text provides a comprehensive account of the history and culture of the Arabian Peninsula, focusing on the genealogies of various tribes and notable figures. The book is particularly valued for its detailed descriptions of the social and political structures of the time. It serves as an important resource for understanding the historical context of the Islamic Golden Age and the development of Arab identity in the region.