The Islamic golden age and the caliphates

"The Islamic empire... in the 7th century ... exercised influence over a large geographic area until its fall to Mongol invaders in the 13th century. The rulers, called caliphs, ushered in a new Islamic civilization with customs and practices both distinct from and partially influenced by those of the areas it conquered. The reigns of these caliphates, including the Abbasid caliphate, which presided at the time of the Islamic Golden Age, are surveyed [in this book and] ... readers will learn about the expansion of Islamic influence and the flourishing of scholarship in science, math, and more during this time"--Amazon.com.