Sasanian coinage was produced within the domains of the Iranian Sasanian Empire (224–651). Together with the Roman Empire, the Sasanian Empire was the most important money-issuing polity in Late Antiquity. Sasanian coinage had a significant influence on coinage of other polities. Sasanian coins are a pivotal primary source for the study of the Sasanian period, and of major importance in history and art history in general. The Sylloge nummorum Sasanidarum is the most important primary work of reference for Sasanian coins.