BTW, Fred, that book (Sell) that you refer to, neglected to mention that the Dark Ages in Spain were pretty brutal.
They were brought to an end by the Moors.
The rest of Europe continued on in intellectual and moral darkness for 4 more centuries.
I'm surprised you didn't know about the Dark Ages.
Umayyad, also Omayyad, first great Arab Muslim dynasty of caliphs (religious and secular leaders) founded by Muawiyah I in 661 and lasting until 750. Uthman ibn Affan, a member of the prominent Umayyad family of Mecca, had been elected to the caliphate in 644 to succeed Umar I, but his weakness and nepotism resulted in rebellion and he was murdered in 656. Uthman was succeeded by Ali, son-in-law of the prophet Muhammad and chief of the legitimist party, which believed that only a member of Muhammad's family could rightfully hold the caliphate. However, Muawiyah I, governor of Syria and first Umayyad caliph, revolted against Ali and, supported by Amr, the conqueror of Egypt, gained the advantage. Hailed as caliph at Jerusalem in 660, Muawiyah I was in complete control soon after the assassination of Ali the following year. Under Muawiyah I the capital was changed from Medina to Damascus. Muawiyah I developed an administrative system modeled after the Byzantine Empire and before his death in 680 had secured the throne for his son, thus putting the state on a dynastic basis. Conquest was begun again with an offensive on all fronts. Under Muawiyah I and his Umayyad successors, Muslim control of the Mediterranean region was completed. The Arabs, led by a fierce North African Berber army commanded by Tariq, crossed from North Africa and eventually conquered Spain; in the east they met no effective opposition until they had passed the borders of India. They were stopped in the west by the Franks under Charles Martel and by the Byzantine Empire, which repulsed an attack on Constantinople early in the 8th century.
MUAWIYAH.