The Barbary Corsairs and the Mediterranean Slave Trade (1516-1830)

The corsair brothers Aruj and Khayr al-Din Barbarossa, operating with Ottoman backing, seized Algiers from its local ruler and established a corsair state on the North African coast. After Aruj's death in 1518, Khayr al-Din pledged allegiance to the Ottoman sultan, who supplied troops and ships in exchange for naval support. Algiers became the seat of an Ottoman regency whose economy rested on raiding, ransom, and the sale of captives.

Location: Algiers, Algeria

A Barbary-Ottoman fleet under Khayr al-Din Barbarossa defeated a Holy League fleet assembled by Pope Paul III and commanded by Andrea Doria at the Battle of Preveza. The victory secured Ottoman-Barbary control of the eastern and central Mediterranean for decades and protected the corsair ports from serious European retaliation. Raiding then expanded across the western Mediterranean and into the Atlantic.

Location: Preveza, Greece

In July 1627 corsair raiders under the renegade commander Murat Reis sacked the island of Heimaey off Iceland, killing dozens and seizing several hundred people for the slave markets, an episode Icelanders call the Turkish Abductions. In 1631 corsairs raided Baltimore in Ireland, taking nearly the entire village population captive. The raids demonstrated that the trade's reach now extended far beyond the Mediterranean, driven by deep-water sailing ships adopted by the corsair fleets.

Location: Heimaey, Iceland

By the mid-17th century, observers estimated around 35,000 Christian captives were held across the Barbary ports, most in Algiers, where slave markets auctioned sailors, fishermen, and villagers seized from ships and coastal raids from Italy to Ireland. The historian Robert Davis has estimated that corsairs enslaved roughly 1 to 1.25 million Europeans between 1530 and 1780, a figure still debated among scholars. Captives who converted could enter service in the regencies; the rest awaited ransom or worked in galleys, construction, and households.

Location: Algiers, Algeria

Alongside the violence ran a durable economy of ransom and tribute. Catholic redemptionist orders such as the Trinitarians and Mercedarians raised funds across Europe to buy back captives, while European states negotiated treaties and paid annual tribute to the regencies to spare their shipping; the writer Miguel de Cervantes spent five years as a captive in Algiers before his ransom was paid in 1580. Many governments judged tribute cheaper than war, and the payments became a recognized channel of North African state revenue.

Location: Algiers, Algeria

After American independence ended the protection of the Royal Navy, the Barbary regencies began seizing United States merchant ships. Algiers and Tripoli captured American vessels in 1785, and the new republic, lacking a navy, followed the European practice of negotiating tribute treaties. Payments to the regencies grew to a substantial share of the young federal budget, and the tactic of paying for safety drew growing criticism in the United States as hostage-taking continued.

Location: Algiers, Algeria

The pasha of Tripoli, dissatisfied with the level of American tribute, declared war on the United States in May 1801, and President Thomas Jefferson dispatched a naval squadron to the Mediterranean rather than pay more. The war that followed included the burning of the captured frigate USS Philadelphia by Stephen Decatur in 1804 and William Eaton's overland march with mercenaries and Marines to capture Derna in 1805. The conflict, commemorated in the Marine Corps Hymn's "shores of Tripoli," established a permanent US naval presence in the Mediterranean.

Location: Tripoli, Libya

With the War of 1812 over, the United States sent Stephen Decatur's squadron back to the Mediterranean. Within weeks Decatur captured Algerian ships and forced Algiers, Tunis, and Tripoli to sign treaties renouncing tribute payments and freeing American captives without ransom. The Second Barbary War marked the first time a power dictated terms to the corsair regencies on their own waters, and it ended American payments to North Africa permanently.

Location: Algiers, Algeria

A British-Dutch fleet under Lord Exmouth bombarded Algiers after the Dey refused European demands to end Christian enslavement, an effort reinforced by the condemnation of the slave trade agreed at the Congress of Vienna the previous year. Under threat of further bombardment, the Dey released some 3,000 Christian captives and agreed to abolish enslavement of Europeans. Corsairing continued in reduced form, but the regencies' raiding economy had lost its protection and its markets.

Location: Algiers, Algeria

Using a diplomatic insult from the Dey as pretext, France invaded Algeria in June 1830 and captured Algiers on July 5, ending the Deylik after three centuries. The conquest closed the slave markets of the Barbary coast for good and began 132 years of French colonial rule in Algeria. The corsair states that had once terrorized European coastlines from Iceland to the Levant passed into history as European powers partitioned North Africa.

Location: Algiers, Algeria