The Moorish Mizabian Grand Rais (17th century Rais).
The Great Moorish Rais (from the 17th century Rais). European writings, especially the testimonies of Christian clergy, give us the name of an Algerian chief known to them as the Grand Maure, or the Great Moor. We will talk about:
His upbringing: The great Maghreb chief grew up in the poorest popular circles in Algeria, where his origins go back to the Bani Mizab. He arrived at a young age in the city of Algiers and worked in the meat trade. Then he decided to join the Algerian navy and worked as a junior sailor in the crew of one of the chiefs.
After a while, he proved his worth and courage at sea, becoming one of the best sailors in Algeria. This is what caught the attention of the captains, who gave him command of a small ship. Then he became captain of a ship carrying thirty cannons.
He was then promoted to command a ship of the Cadiz type, which made him one of the largest captains of Algeria and the most famous commanders of its fleet during the first half of the seventeenth century.
Some of his military actions: The great Maghreb chief was known for his audacity, intelligence, and courage, which sparked terror among European sailors. It was reported in one of the issues of the French newspaper La Gazette, published in 1635, that this great Maghreb had stormed, with his soldiers, a large galleon-type ship belonging to the Republic of Naples.
Equipped with seventy-six cannons, he captured it, capturing about one hundred and thirty sailors, and seized about ten thousand pairs of stockings, a large quantity of wheat, about twenty boxes of gold thread, and ten thousand cannon shells.
D'Aranda, Father Le Pére D'Egreville, and Father Le Pére Hérault are considered among the few sources that referred to this great Maghreb, as D'Aranda devoted a paragraph to him in his book, which we quote as follows:
Darenda devoted a paragraph to him in his book, which we quote as follows: “This great Moro - who terrorized all the Christian ships that frequented the Mediterranean, and was sacred to the Turks - means Muslims because the Spaniards used to use the word Turk to every Muslim.
I believe that if the Ottoman Sultan had appointed him as Commander-in-Chief of the fleet, as Sultan Suleiman did by appointing the great pirate Barbarossa in the last century, the victories of this Moro would have surpassed all the Ottoman generals. He is a lion in battles and a sheep after victories. He treats his defeated enemies with much kindness and gentleness,” he concluded his words.
Father Degreville points out the importance of this leader in the issue of ransom of Christian prisoners in Algeria and his effective role in it. He mentions that all the European envoys used to turn to him because of his influence and his voice heard by all the population groups in Algeria, and because of his moral strength with the higher authorities in the Eyala.
Father Degreville adds that the weight of the personality of this great Moro was comparable to the ruling Pasha, the fleet commander, and the Agha. He says: “This great civil servant whom they mention like this without mentioning his name had the privilege of obtaining a special price for slaves in the same manner as the Pasha, and some of the senior officials in Algeria.” He ended his words. .While Father Hero mentioned that he sought help from “Sir Al-Moro the Grand Moro” during his negotiations in Algeria, who promised him assistance in the issue of the prisoners, and he mentioned that the Great Moro had thanked him for freeing President Mohamed Negrillo, who was captive in France. 
Sources: 1. Al-Munawar Maroush - Studies on Algeria in the Ottoman Era, Piracy and Myths, Part 1 - pp. 290, 292 2. Emanuel D'Aranda - les captifs d'Alger. P. 137 @rattibha