It is a work of prime importance ... this research offers a clear understanding of the complex early Islamic history ... this is an eloquent work with opens up new directions for research and reflection on the history of the Ibadi Imamate, its role and function in the islamic world and its political implications and effects for Islamic history more widely. ... It is a contribution that enriches the knowledge of the Western world about the world of Islam and also the knowledge of the Islamic world about itself.