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.

Captain Flint is one of the main characters in the book Treasure Island, created by Robert Louis Stevenson in 1883. In Stevenson's book, Flint, whose first name is not given, was the captain of a pirate ship, The Walrus, which accumulated an enormous amount of captured treasure, approximately £700,000. Flint and six members of his crew bury the plunder on an island located somewhere in the Caribbean Sea. Flint then murders his six assistants, leaving the corpse of one, Allardyce, with its arms outstretched in the direction of the buried treasure.

The location of the treasure is marked by Flint on a map and entrusted to his first mate William "Billy" Bones. It later falls into the hands of the protagonist of the novel, Jim Hawkins.

The only person Flint was said to fear was his quartermaster John Silver, who later even called his parrot "Captain Flint" in mockery.

Flint is said to have died in Savannah, shouting, "Darby M'Graw - fetch aft the rum...." His death was said in the book to have been caused by the effects of rum. The inscription on the map suggests that he died in 1754.

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