Bartholomew Roberts (17 May 1682 – 10 February 1722), born John Roberts, was a Welsh pirate who was, measured by vessels captured, the most successful pirate of the Golden Age of Piracy. During his piratical career, he took over 400 prize ships, although most were mere fishing boats. Roberts raided ships off the Americas and the West African coast between 1719 and 1722; he is also noted for creating his own pirate code, and adopting an early variant of the Skull and Crossbones flag.
Roberts' infamy and success saw him become known as The Great Pyrate and eventually as Black Bart (Welsh: Barti Ddu, though this was a later attribution and was not used in his lifetime), and made him a popular subject for writers of both fiction and non-fiction. To this day, Roberts continues to feature in popular culture, and has inspired fictional characters (such as the Dread Pirate Roberts).