This category includes all coinage pertaining to the Abbasid dynasty. It was the third Islamic caliphate, founded in 750 AD. They overthrew the Ayyubid dynasty and built their capital in Baghdad. Their power extended over some 150 years, and after gradually losing influence in the Islamic world, they were expelled from Baghdad by the Mongols in 1258 AD. They continued to hold some power in Egypt up to the time of the Ottoman empire.