Rahmah ibn Jabir ibn Adhbi al-Jalhami (1760–1826) was an Arab ruler in the Persian Gulf region and was described by his contemporary, the English traveler and author, James Silk Buckingham, as "the most successful and the most generally tolerated pirate, perhaps, that ever infested any sea."
As a pirate, he had a reputation for being ruthless and fearless. He wore an eyepatch after losing an eye in battle, which makes him the earliest documented pirate to have worn an eyepatch. He was described by the British statesman Charles Belgrave as "one of the most vivid characters the Persian Gulf has produced, a daring freebooter without fear or mercy" (ironically, his first name means "mercy" in Arabic).
He assisted the British forces in the Persian Gulf campaign of 1819 against the Al-Qasimi of Ras Al Khaimah.
Description of the book, "The Myth of Arab Piracy in the Gulf" By Muhammad Al-Qasimi, the Emir of the Emirate of Sharjah of the UAE:
The British became the dominant power in the Arab Gulf in the late eighteenth century. The conventional view has justified British imperial expansion in the Gulf region because of the need to supress Arab piracy. This book, first published in 1988, challenges the myth of piracy and argues that its threat was created by the East India Company for commercial reasons. The Company was determined to increase its share of Gulf trade with India at the expense of the native Arab traders, especially the Qawasim of the lower Gulf. However, the Company did not possess the necessary warships and needed to persuade the British Government to commit the Royal Navy to achieve this dominance. Accordingly the East India Company orchestrated a campaign to misrepresent the Qawasim as pirates who threatened all maritime activity in the northern Indian Ocean and adjacent waters. Any misfortune that happened to any ship in the area was attributed to the ‘Joasmee pirates’. This campaign was to lead eventually to the storming of Ras al-Khaimah and the destruction of the Qawasim. Based on extensive use of the Bombay Archives, previously unused by researchers, this book provides a thorough reinterpretation of a vital period in Gulf history. It also illuminates the style and method of the East India Company at a critical period in the expansion of the British Empire.
An excerpt from, "Historical Perspectives on Piracy: The British Empire in the Persian Gulf" By Aniruddha Bose, Gateway House: Indian Council on Global Relations:
The second complicating factor is the curious part played by a pirate by the name of Rahmah bin Jabbar. Rahmah bin Jabbar was possibly the most successful and well known pirate operating in the Persian Gulf at the time. A member of the Jalama tribe, Rahmah bin Jabbar had been born into a humble family from Qurain (modern day Kuwait). Rahmah bin Jabbar began his career as a lowly horse dealer, before moving on to piracy. He started with one small vessel and ten companions with whom he began running a protection racket along the coast of the Arabian Gulf. At the height of his power Rahmah bin Jabbar commanded an entire fleet of pirate vessels, and the loyalty of an estimated 2,000 pirates. The largest of his vessels was a 300 ton ship manned by 350 men. Rahmah bin Jabbar protected his fleet by building alliances, including an alliance with the Al-Saud dynasty (the current ruling family of Saudi Arabia). He later shifted his loyalties towards the Al Bu Sa’id dynasty of Oman. Riding the coattails of the expanding Omani maritime Empire, Rahmah bin Jabbar built a flourishing business based on piracy. In the early 19th century, the pirates of the Qawasim tribal confederacy were his only serious rivals.
Rahmah bin Jabbar was in many ways the quintessential pirate. The British historian Charles Belgrave called him “one of the most vivid characters the Persian Gulf has produced, a daring freebooter without fear or mercy.” The contemporary English traveler and writer James Silk Buckingham described him as “the most successful…pirate, perhaps, that ever infested any sea.” He even wore an eye patch, having lost an eye in battle. Curiously, during the East India Company’s anti-piracy operations in the early nineteenth century, Rahmah bin Jabbar fought alongside the British. This was a truly remarkable state of affairs where a pirate fought alongside what was an avowedly anti-piracy mission. The key to the mystery lay in the fact that Rahmah bin Jabbar had identified the British as allies in his struggle against the Qawasim. Loch wrote in his diary, “He was as great a pirate as those of the [Qawasim] tribe with this exception:he protected British trade, and was at peace with [British allies] Basra and Bushire, but at war with every other part of the Gulf.” Rahmah bin Jabbar, possibly in honor of this alliance named his own flagship the Al-Manowar (after the English ‘Man o’ War’).
. . .The records suggest two significant conclusions. First, the anti-piracy operations took very long to succeed, and were very expensive. The operations began in the 1800s and continued well into the second half of the nineteenth century. The operations involved warships as well as ground forces. The costs were substantial. Second, the curious case of the pirate Rahmah bin Jabbar throws into question the dividing lines between pirates and the British Empire. The alliance that brought Rahmah bin Jabbar and the British suggest that the East India Company was less interested in suppressing piracy in the Indian Ocean region than it was in protecting its own ships. The Company and perhaps the British in general were perfectly happy supporting piracy, as long as it did not affect British commercial interests. The evidence suggests that the evils of piracy, at least in this period, were very much in the eyes of the beholder.