 After the fall of the Sasanian dynasty in 651, the Umayyad Arabs adopted many of the Persian customs, especially the administrative and the court mannerisms.Arab provincial governors were either persianized Arameans or ethnic Persians; certainly, Persian remained the language of official business of the caliphate until the adoption of Arabic toward the end of the 7th century, when, in 692, minting began at the caliphal capital, Damascus.The new Islamic coins evolved from imitations of Sasanian and Byzantine coins, and the Pahlavi script on the coinage was replaced with Arabic.