The Umayyad Dynasty then expanded the empire west to Spain and moved the capital to Damascus because it was closer to the action empire-wise, but still technically in Arabia. That was really important to the Umayyads because they'd established this hierarchy with the Arabs like them at the top, and in fact they tried to keep Arabs from fraternizing with non-Arab Muslims throughout the empire. This, of course, annoyed the non-Arab Muslims, who were like, I don't know if you're reading the same Quran we are, but this one says that we're all supposed to be equal. And pretty quickly a majority of Muslims weren't Arabs, which made it pretty easy for them to overthrow the Umayyads, which they did in 750 CE. Another replacement is the Abbasids. Abbasids? Hold on.