Byzantine currency primarily consisted of gold coins known as solidus, which were introduced during the reign of Emperor Constantine I in the 4th century. The solidus became a standard for trade and was widely accepted across the Byzantine Empire and beyond, facilitating commerce and economic stability. In addition to the solidus, the Byzantine Empire also issued silver coins called miliaresion and copper coins known as follis. These coins featured images of emperors and religious symbols, reflecting the empire's wealth and cultural significance. The currency system played a crucial role in maintaining the empire's economy for over a thousand years.