The Moro Pirates, also known as the Sulu Pirates, were Muslim outlaws of the southern Philippines who engaged in frequent acts of piracy, primarily against the Spanish, beginning in the late 16th century. Because of the continual wars between Spain and the Moro people, the areas in and around the Sulu Sea became a haven for piracy which was not suppressed until the beginning of the 20th century. The pirates should not be confused with the naval forces or privateers of the various Moro tribes. However, many of the pirates operated under government sanction during time of war.
The pirate ships used by the Moros were known as proa, or garays, and they varied in design. The majority were wooden sailing galleys about ninety feet long with a beam of ten feet. They carried around fifty to 100 crewmen. Moros usually armed their vessels with three swivel guns, called lelahs or lantakas, and occasionally a heavy cannon, proas were very fast and the pirates would prey on merchant ships becalmed in shallow water as they passed through the Sulu Sea. Slave trading and raiding was also very common, the pirates would assemble large fleets of proas and attack coastal towns. Hundreds of Christians were captured and imprisoned over the centuries, many were used a galley slaves aboard the pirate ships.
Other than muskets and rifles, the Moro pirates, as well as the navy sailors and the privateers, used a sword called the kris with a wavy blade incised with blood channels. The wooden or ivory handle was often heavily ornamented with silver or gold. The type of wound inflicted by its blade makes it difficult to heal. The kris was used often used in boarding a vessel. Moros also used a kampeli, another sword, a knife, or barong and a spear, made of bamboo and an iron spearhead. The Moro's swivel guns were not like more modern guns used by the world powers but were of a much older technology, making them largely inaccurate, especially at sea. Lantakas dated back to the 1500s and were up to six feet long, requiring several men to lift one. They fired up to a half-pound cannon ball or grape shot. A lantaka was bored by hand and were sunk into a pit and packed with dirt to hold them in a vertical position. The barrel was then bored by a company of men walking around in a circle to turn drill bits by hand.
The Spanish engaged the Moro pirates frequently in the 1840s. The expedition to Balanguingui in 1848 was carried out by Brigadier José Ruiz and a fleet of nineteen small warships and hundreds of Spanish Army troops. They were opposed by at least 1,000 Moros held up in four forts with 124 cannons and plenty of small arms. There were also dozens of proas at Balanguingui but the pirates abandoned their ships for the better defended fortifications. The Spanish stormed three of the positions by force and captured a remaining one after the pirates had retreated. Over 500 prisoners were freed in the operation and over 500 Moros were killed or wounded, they also lost about 150 of their proas. The Spanish lost twenty-two men killed and around 210 wounded. The pirates later reoccupied the island in 1849 and another expedition was sent but they encountered only light resistance
Also in the 1840s, James Brooke became the White Rajah of Sarawak and he led a small navy in a series of campaigns against the Moro pirates. In 1843 Brooke attacked the pirates of Malludu and in June 1847 the rajah participated in a major battle with pirates at Balanini where dozens of proas were captured or sunk. Brooke fought in several more anti-piracy actions in 1849 as well. During one engagement with Illanun Sulus in 1862, Captain James Brooke, the white rajah of Sarawak, sank four proas, out of six engaged, by ramming them with his small four gun steamer Rainbow. Each pirate ship had over 100 crewmen and galley slaves aboard and all were armed with three brass swivel guns. Brooke lost only a few men killed or wounded while at least 100 pirates were killed or wounded. Several prisoners were also released. 
A Piratical Proa in Full Chase by Charles Ellms, 1837.
A Moro proa armed with a lantaka at the bow.
A Sulu pirate, by Victor Hong.
The Spanish landing at Balanguingui by Antonio Brugada.
A kris sword found in Java.
A 19th century barong from the Sulu Archipelago.
See also 
- Root, pg. 383-397
- [dead link]
- "Discover Sabah - History". Flyingdusun.com. Retrieved 2013-02-06.
- "Sketches of Our Life at Sarawak, by Harriette McDougall (1882)". Anglicanhistory.org. Retrieved 2013-02-06.
- [dead link]
- "The Career and Character of Rajah Brooke". Scribd.com. 2012-11-18. Retrieved 2013-02-06.
- Root, Elihu (1902). Elihu Root collection of United States documents relating to the Philippine Islands, Volume 91, Part 2 91. New York Public Library: US Government Printing Office.