Sacred Band

[Ibrahim]

Spoiler Alert, click show to read: 

Does anyone else think this guy looks like he's holding a chainsaw?
I never knew the 'barbarians' were so advanced.

that's a sword. I think you already know that though

and he's an Arab-specifically abd al-malik ibn marwan, who was an umayyad Caliph in the late 7th century. this particular coin was before he began to issue a style of dinar independant of the roman pattern, which presented the faces of people on it. He decided we need a new unique style, to flip the finger at the Byzantines, who at the time partially controlled the mint.