the Dome of the Rock in Jerusalem, Byzantine craftsmen were used to create the mosaic decoration
??
The Muslims who conquered Palestine were a bunch of stupid camel drivers from the desert. They knew nothing about architecture or the fine arts and crafts. So they had their new slaves build their buildings and decorate them.
I was told that the Caliph 3Abd al-Malik hired Byzantine workers from Syria to build the dome & his son Walid also hired them to build some other mosques in Damascus. The dome was intended to rival the church of the Sepulchre, so a lot of money was invested into it & it has some of the same elements.