Moors were predominantly Berbers/North Africans.
The Blacks were assimilated & only had subservient roles in relation to the Moorish Berbers.
Watch this:
As for the second part: mutawallids( berberized concubine ofspring) who came to be considered moor doesnt explain what these ancients wrote:
4th c. A.D. - the Roman Claudius complained of the chief of the “Mauri Bavares” in North Africa taking noble Roman women of the Levant. It was written of the chief, “when tired of each noblest matron, Gildo hands her over to the Moors.” And these, “Sidonian mothers, married in Carthage city must needs mate with barbarians. He thrusts upon me an Ethiopian as a son-in law, a Berber as a husband. The hideous hybrid affrights its cradle” (Platnauer, 1922, p.113
5th c. A.D. - “The Moors have bodies black as night, while the skin of the Gauls is white..." written by Isidore of Seville in
The Etymologies of Isidore of Seville - translation by Steven A. Barney published 2007. p. 386. St. Isidore also, “underlines the fact that Moors are so named because they are black, and their blackness comes from the heat of the sun." St. Isidore(9.2.121-23)” (Ramey, L., Monstrous Alterity in Early Modern Travel Accounts.
Esprit Createur, (48)1, pp. 81-952008).
6th c. A.D.- Corippus, a Byzantine in Book I 245 of Johannidus, Book 1, 245, speaking of Moors in the area of North Africa who he felt had "faces of a horrible black color" stated - “Maura videbatur facies, nigro colore horrida” (Michell, G.B. (1903, Jan.). The Berbers.
Journal of the Royal African Society, 2(6), (pp. 161-194). He also refers to some Moorish captives as "black as crows".
6th c. A.D. - Procopius, a Byzantine in his
History of the Wars book IV contrasting a white peoples who had settled in North Africa claimed they were not “black skinned like the Mauri...” The Mauri he knew lived in the area stretching from Leptis Magna to the Aures and Kabyle Mountains. The history books today call them "Berbers".
9th c. A.D. - A Norse saga translated into Gaelic speaks of the Moors of the 9th c. reads, "After this the Lochlanns (Danes) passed over the whole country, and they plundered and burnt the whole country and they carried off a great host of them as captives to Erin and these are the blue men of Erin, for Mauri is the same as black (Nigri) man and Mauritania is the same as blackness…Long indeed were these blue men in Erin…’ Howorth, H.H. (1884).
Early Intercourse Between the Franks and Danes,
Transactions of the Royal Historical Society 1, pp. 18-61
9th c. A.D. - Saedulius Scotus, a Celtic monk in a letter to an Italian ruler refers to the horrible "black faces" of "the Saracen" invaders of southern Italy.