 Complete the following phrase:  The Abbasid Caliphate  or ,  was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammads uncle, Abbas ibn Abdul-Muttalib 566653 CE, from whom the dynasty takes its name. They ruled as caliphs for most of the caliphate from their capital in Baghdad in modern-day Iraq, after having overthrown the Umayyad Caliphate in the 