This the earliest Islamic copper coins, a fals supposedly issued under of one of the first Caliphs (c. 630-660 AD). It is a crude copy of a Byzantine follis from Emperor Heraclius, showing the Byzantine imperial family. By the end of the 7th century the fals was used throughout the Arabic world. It is a subunit of several Arabic currencies until today, for instance in Iraq, Jordan, Kuwait, the United Arab Emirates and Yemen.