The central location of the Hijaz between the Sasanian and Byzantine empires was of great importance in its commercial and financial activities, and the money of these two countries had been used as a means of trading in the Hijaz trade transactions, and the Quraish winter and Chinese trips to Yemen respectively were a major source of silver and gold coins.
The Sasanians used the silver dirham as their currency, while the Byzantines used the gold dinar as their currency.
The Meccans were active due to the existence of the Kaaba and the influx of pilgrims from different parts of the island to trade, banking and currency exchange without restriction, as no official price was imposed on the currency to be taken today and left tomorrow, but its value was estimated according to its weight as a precious metal, and this was done with the weights of kantar, rabbit and weight.
The royal immigrants later transferred their skills in trade and banking to the agricultural city of Yathrib, making it a commercial center competing with their city of Mecca.
The golden Byzantine dinars had a circular disc shape, which was depicted on one side of the Byzantine Empire, which was ordered to be minted. At the dawn of Islam, the image was of the Emperor Hercules or with his two sons, Heracleionas and Constantine. Each of them seized a long cross and each of them was crowned with another cross.