Byzantine coinage refers to the currency system used in the Byzantine Empire, which lasted from the 4th to the 15th century. The most famous coin was the solidus, a gold coin introduced by Emperor Constantine I. Byzantine coins often featured images of emperors, saints, and religious symbols, reflecting the empire's wealth and culture. The coinage system evolved over time, with various denominations including silver miliaresion and copper coins. These coins facilitated trade across the empire and beyond, influencing economies in regions such as Italy and the Middle East. Byzantine coinage played a crucial role in the empire's economic stability and cultural exchange.