Background
Although there was a dictum that the Byzantine solidus was not to be used outside of the Byzantine empire, there was some trade that involved these coins which then did not get re-minted by the emperors minting operations, and quickly became worn. Towards the end of the 7th century CE, Arabic copies of solidii - dinars issued by the caliph Abd al-Malik (685-705 CE), who had access to supplies of gold from the upper Nile - began to circulate in areas outside of the Byzantine empire. These corresponded in weight to only 20 carats (4.0 g), but matched with the weight of the worn solidii that were circulating in those areas at the time. The two coins circulated together in these areas for a time.
Read more about this topic: Islamic Gold Dinar
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