“Which Umayyad ruler standardized the currency?”

"Abdul Malik Ibn Marwan an Umayyad caliph standardized the currency by introducing the Islamic dinar and dirham in the late 7th century. This reform unified the caliphate’s economy facilitating trade and governance across vast regions. His policies strengthened the Umayyad administration leaving a lasting impact on Islamic economic systems. Understanding his contributions highlights the Umayyads’ role in shaping early Islamic governance commerce and cultural integration influencing the development of Islamic civilization."