Question: Long John Silver was quartermaster under what 18th-century fictional captain?

full_context: Document 1: Captain Jat: Captain Jat is a fictional sea captain created by English writer William Hope Hodgson. Captain Jat was another attempt to create a recurring character, like Hodgson's Captain Gault. Captain Jat is featured in the stories "The Island of the Ud" and "The Adventure of the Headland". Captain Jat himself is a tall, lean man, interested primarily in "treasure and women," who takes cabin boy Pibby Tawles into his confidence. In "The Island of the Ud" their relationship is described as follows:
Document 2: Jim Hawkins and the Curse of Treasure Island: Jim Hawkins and the Curse of Treasure Island is an adventure novel by Frank Delaney, written under the pseudonym of Francis Bryan. It is a sequel to the novel Treasure island by Robert Louis Stevenson.
Document 3: Long John Silver's: Long John Silver's LLC is an American fast-food restaurant chain that specializes in seafood. The brand's name is derived from the novel "Treasure Island" by Robert Louis Stevenson, in which the pirate "Long John" Silver is one of the main characters. Formerly a division of Yum! Brands, Inc., the company was divested to a group of franchisees in September 2011.
Document 4: Black Spot (Treasure Island): The Black Spot is a literary device invented by Robert Louis Stevenson for his novel "Treasure Island". In the book, pirates are presented with a "black spot" to officially pronounce a verdict of guilt or judgement. It consists of a circular piece of paper or card, with one side blackened while the other side bears a message and placed in the hand of the accused. It was a source of much fear because it meant the pirate was to be deposed as leader, by force if necessary—or else killed outright. In "Treasure Island", Billy Bones is much frightened by it but remains determined to outwit his enemies; however, he suffers a stroke caused by the overconsumption of liquor and dies. Later Long John Silver receives the spot, but is calm enough to notice that the paper bearing the spot has been torn out from a Bible, and warns his associates of the ill luck this will bring upon them.
Document 5: The Adventures of Long John Silver: The Adventures of Long John Silver is a TV series about the Long John Silver character from "Treasure Island". It was made in 1954 in colour in Australia for the American and British markets before the development of Australian television.
Document 6: Treasure Island: Treasure Island is an adventure novel by Scottish author Robert Louis Stevenson, narrating a tale of "buccaneers and buried gold".
Document 7: Treasure Island (1934 film): Treasure Island is a 1934 film adaptation of Robert Louis Stevenson’s famous 1883 novel "Treasure Island". Jim Hawkins (Jackie Cooper) discovers a treasure map and travels on a sailing ship to a remote island, but pirates led by Long John Silver (Wallace Beery) threaten to take away the honest seafarers’ riches and lives.
Document 8: Silver (Andrew Motion novel): Silver: Return to Treasure Island, is a novel by former British Poet Laureate Andrew Motion, published by Jonathan Cape on 15 March 2012. The book follows Jim Hawkins, son of the character of the same name in Robert Louis Stevenson's 1883 novel "Treasure Island", as he and Nat, daughter of Long John Silver, also a character in "Treasure Island", return to the island visited by their fathers to claim abandoned bar silver.
Document 9: Woodes Rogers: Woodes Rogers ("ca." 1679 – 15 July 1732) was an English sea captain and privateer and, later, the first Royal Governor of the Bahamas. He is known as the captain of the vessel that rescued marooned Alexander Selkirk, whose plight is generally believed to have inspired Daniel Defoe's "Robinson Crusoe".
Document 10: Long John Silver: Long John Silver is a cunning and opportunistic pirate who was quartermaster under the notorious Captain Flint. Long John Silver had a pet parrot called Captain Flint, often seen sitting on his shoulder where she would nibble on seeds. Silver claims to have served in the Royal Navy and lost his leg under "the immortal Hawke". "His left leg was cut off close by the hip, and under the left shoulder, he carried a crutch, which he managed with wonderful dexterity, hopping about upon it like a bird. He was very tall and strong, with a face as big as a ham—plain and pale, but intelligent and smiling." ("Treasure Island" (1883) by Robert Louis Stevenson page 82). He claims to have been the only man whom Flint ever feared. Like many of Stevenson's characters, there is more than a modicum of duality in the character; ostensibly Silver is a hardworking and likeable seaman, and it is only as the plot unfolds that his villainous nature is gradually revealed. His relationship with Jim Hawkins, the novel's protagonist and narrator, is interesting, as he serves as a mentor and eventually father-figure to Jim, creating much shock and emotion when it is discovered that he is in charge of the mutiny, and especially when Jim must confront and fight him later on. Although willing to change sides at any time to further his own interests, Silver has compensating virtues: he is wise enough to pay attention to money management, in contrast to the spendthrift ways of most of the pirates, and is physically courageous despite his disability; for instance, when Flint's cache is found to be empty, he coolly stands his ground against five grown men despite having only Jim, a boy in his teens, to back him.
Document 11: Treasure Island (1999 film): Treasure Island is a 1999 film adaptation of Robert Louis Stevenson's novel "Treasure Island". It was written & directed by Peter Rowe, and starred Kevin Zegers as Jim Hawkins and Jack Palance as Long John Silver in his final film appearance.
Document 12: Long John Silver (film): Long John Silver, also known as Long John Silver's Return to Treasure Island, is a 1954 American-Australian Adventure film about the eponymous pirate from "Treasure Island", starring Robert Newton as Silver and Rod Taylor as Israel Hands.
Document 13: John Silver (pigeon): John Silver was a war pigeon active with the United States Army in World War I. He served with distinction during World War I. He was knocked out of the air twice by cannon flak, but he got back up both times and completed his mission. He lost an eye and a leg, so he was given an eye patch and a wooden leg, hence the name "Long John Silver". He is also wearing the medal he was awarded.. s of 2010 the animal is on display at the National Museum of the United States Air Force.
Document 14: Pirates in popular culture: In English-speaking popular culture, the modern pirate stereotype owes its attributes mostly to the imagined tradition of the 18th century Caribbean pirate sailing off the Spanish Main and to such celebrated 20th century depictions as Captain Hook and his crew in the theatrical and film versions of "Peter Pan", Robert Newton's portrayal of Long John Silver in the 1950 film of "Treasure Island", and various adaptations of the Eastern pirate, "Sinbad the Sailor". In these and countless other books, movies, and legends, pirates are portrayed as "swashbucklers" and "plunderers." They are shown on ships, often wearing eyepatches or peg legs, having a parrot perched on their shoulder, and saying phrases like "Arr, matey" and "Avast, me hearty." Pirates have retained their image through pirate-themed tourist attractions, traditional film and toy portrayals of pirates, and the continued performance and reading of books and plays featuring pirates.
Document 15: Captain Flint: Captain J. Flint is a fictional 18th-century pirate captain who features in a number of novels, television series, and films. The original character was created by the Scottish writer Robert Louis Stevenson (1850-1894). Flint first appears in the classic adventure yarn "Treasure Island", which was first serialised in a children's magazine in 1881, and later published as a novel in 1883.
ground_truth: Captain J. Flint