The author proposes in this study a new, integrative approach to the phenomenon of Muslim pious foundations, or waqfs. The evolution of the institution is analysed from the perspective of the formation of power systems, which shaped both the elaboraton of the textual framework of the institution and the practices connected with the founding and administration of waqf-objects. The growing interference of the state in the field of waqfs and in the hierarchy of the ulama is seen as essential for the development of the institution in the Ayyubid, Mamluk and Ottoman periods....