The Ayyubid Dynasty was founded by Saladin, one of the most famous islamic war warriors of all time. Personally, this is one of my favorite historical coins, and he interests me the most out of all islamic figures. Of course, besides Khalid ibn Walid.
I have a dirhem struck under Harun ar-Rashid and with a quote by or the mention of Ja’far, which I think is pretty cool. He was the vizier who set up a paper mill in Baghdad with Chinese workers, so he had a large role in the spread of and preservation of knowledge which happened during the early Caliphates.