How widespread was authorship among rulers in the premodern Islamic world? The writings of different types of rulers in different regions and periods are analyzed in this book, from the early centuries in the central lands of Islam to 19th century Sudan. The composition of poetry appears as the most fertile area for authorship among rulers. Prose writings show a wide variety, from astrology to bookmaking, from autobiography to creeds. Some of the rulers made claims to special knowledge, but in all cases authorship played a special role in the construction of the rulers' authority and legitimacy.