Flag of the regency of Algiers
Own work based on: 

عبد الرحمن بن محمد, جيلالي (1994)    (in Arabic)   تاريخ الجزائر العام للعلامة عبد الرحمن الجيلالي الجزء الثالث: الخاص بالفترة بين 1514 إلى 1830م, الجزائر:  الشركة الوطنية للنشر والتوزيع, pp. 40   (The General History of Algeria by Abd al-Rahman al-Jilali Part Three: Regarding the Period Between 1514 and 1830): "so he first moved to the city of Cherchell and occupied it in 922 AH (1516 AD) and then advanced to the city of Algiers on the same date, so he rescued it from the clutches of the Spanish and strengthened it with his symbolic three colored flag: green, yellow and red colors, and his brother Khair al-Din at that time was busy conquering the city of Mostaganem."(1965)  كتاب حرب الثلاثمائة سنة بين الجزائر واسبانيا 1492 – 1792, الشركة الوطنية للنشر والتوزيع, p. 175   (The Three Hundred Years' War between Algeria and Spain 1492-1792 by Ahmad taoufik Al-Madani): "The death sentence was in his hands, and he became the sole authority in the city of Algiers. He raised his banners of three colors above its walls and castles: green, yellow and red, and spread his authority after a short period of time over the entire plains surrounding the city of Algiers. He took the initiative to mint coins bearing his emblem, on which he wrote: “Mit in Algiers.”"Kahlaoui, Tarek (16 January 2018)    (in English)   Creating the Mediterranean: Maps and the Islamic Imagination, BRILL, pp. 216  ISBN:  978-90-04-34738-0. : "The city of Algiers is represented by a flag of red, yellow and green horizontal stripes in an Ottoman atlas of 1551 (Al-Sharafīʼs atlas of 1551)."Gaïd, Mouloud (1975)    (in French)   L'Algérie sous les Turcs, Maison tunisienne de l'édition, pp. 58  : "The great flag of Algiers, formed of three bands of silk in red, green and yellow, majestically deployed over the gate."Galibert, Léon (1844)    (in French)   L'Algérie: ancienne et moderne depuis les premiers éstablissements des Carthaginois jusqu'à la prise de la Smalah d'Abd-el-Kader, Furne, pp. 181   Quoted by بلقاسم, مولود قاسم نايت (1985)    (in Arabic)   شخصية الجزائر الدولية وهيبتها العالم العالمية قبل سنة ١٨٣٠, دار البعث،, pp. 142   : "The great national flag of Algiers, formed of three bands of silk, red, green and yellow, was displayed majestically above the Bab-Azoun gate,"Assari, Nadir (2007)    (in French)   Alger: des origines à la régence turque, Alpha, pp. 69  ISBN:  978-9961-780-15-2. : “During the Turkish era, the flag of Algiers was made up of three bands of red, green and yellow silk. »(in French) (1837)  Fondation de la régence d'Alger: histoire des Barberousse, chronique arabe du XVIe siècle, publiée sur un manuscrit de la Bibliothèque royale, avec un appendice et des notes : expédition de Charles-Quint, Bouslama, pp. 193  : “ it was from the top of its vast terraces (Jenina palace) on which floated the red, yellow and green standard.”Bernard, Marius (1887)    (in French)   L'Algérie qui s'en va, Plon, Nourrit, pp. 39  : "Nothing is missing, not even the long pole on which the insolent flag of the regency flew for so long with its three horizontal bands, yellow at the bottom, red at the top, green in the middle."

			
			
the standard flying from an Algerine Xebec near Gibraltar, by Dominic Serres (1722-1793).

			
		
		
			
			
The standard flying from a Barbary pirate ship, by Circle of Adriaen van Diest (1655-1704).

			
		
		
			
			
"Algiers flag" in 17th 18th century FLAGS PRINT 1950s.

			
		
		
			
			
58 Early form of Algerian Flag in "The Flags of the World" Plate 7, volume 6-143.

			
		
		
			
			
Portrait of "Hayreddin Barbarossa, Founder of the State of Algiers" by Mohammed Racim.

			
		
“

The seven standards of the bey.
The Bache-Allam stood in the center, carrying the large standard of embroidered green silk, on which was embroidered this sentence:  نَصْرٌ مِّن اللَّهِ وَفَتْحٌ قَرِيبٌ (With the help of God the conquest is near).
This flag was bordered with gold and silver fringes and topped with a silver globe. On each side marched the three other flags without inscription, generally composed of three vertical bands red, yellow, red.


”
—(in French) (1867)  Revue africaine: journal des travaux de la Société Historique Algérienne  

			
			
Flag of the Barbarossa brothers in the National Maritime Public Museum, Algiers

			
		
		
			
			
Regimental Flag of Algiers (according to Richard Holmes Laurie)

			
		
Other Standards of the Regency of Algiers

			
			
Alternative Flag of the Regency of Algiers (XVI century)

			
		
		
			
			
Type of War Standard (according to B. Dubreuil and Pierre Lux-Wurm)

			
		
		
			
			
Algerian Naval Flag (Algerian Corsairs) before 1830 (according to K.-H. Hesmer)

			
		
		
			
			
Algerian Land forces Flag (Algerian Odjak) before 1830 (according to (in English) (1986)  Flag Bulletin, Flag Research Center., p. 166  )
Nourerrahmane