 During this time, mints in cities on the Moroccan coast (Fes, Sijilmasah, Sfax, and al-Nakur) occasionally issued coins with the names of Umayyad caliphs, showing the extent of Umayyad diplomatic influence.The text of a letter of friendship from a Berber leader to the Umayyad caliph has been preserved in the work of 'Isa al-Razi.During the reign of Abd ar-Rahman III tensions increased between the three distinct components of the Muslim community in al-Andalus