What built the greatness of the Umayyad state was the Islamic conquests of that era, which made Islam a vast world in which it spread a new civilization, science, and religion. The discussion here is limited to the conquest of Andalusia, and if we return to the above, we find that the events enabled the Arabs to seize control of Andalusia, and the credit goes back to This was due to the audacity of Tariq and the courage of Musa bin Nusayr, and then we soon saw the return of these two leaders and the fate of Andalusia to the governorship. Musa's departure was in the year 96 AH and the rule continued. Governors until the year 138 AH, and during that short period there were many important historical events.