Why did Abd al-Malik introduce an Arabic coinage?

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The fifth Umayyad caliph, Abd al-Malik, introduced an Arabic coinage toward the end of the 7th century to align the empire's currency with the principles of Islam.1

Prior to this reform, the early Islamic state had largely mimicked the coinage of its predecessors, using Byzantine-style gold and copper pieces in the west and Sāsānian-style silver dirhams in the east. By instituting a new, "reformed" coinage, Abd al-Malik replaced these imitative designs with coins featuring skillfully arranged Qurʾānic inscriptions and the Muslim profession of faith, rather than pictorial types.1

This initiative was part of a broader program of Arabization implemented by the caliph to centralize authority within the Islamic world. By establishing an official Arabic coinage, he reinforced the cultural and administrative identity of the empire, complementing his efforts to make Arabic the official language of administration.2