- “I always fancied it should have a placard at its borders: "Welcome to Casnewydd-Bach, the town you have just passed."”
- ——Bartholomew Roberts regarding his home town, 1719.[来源]
The Templar Order located Roberts sometime in 1715, in Spanish lands in South America, and subsequently took him to Havana. The Assassin Mentor Ah Tabai caught wind of the capture and sent his finest student, Duncan Walpole, to free Roberts and bring him to the Assassin city of Tulum. However, Walpole had secretly turned traitor to the Brotherhood and abandoned his mission.
Roberts eventually arrived in Havana, where he was imprisoned in the estate of Laureano de Torres y Ayala. Torres, his fellow Templars Woodes Rogers and Julien du Casse, along with Edward Kenway – who had killed Walpole and taken his identity – met Roberts at the Havana docks before taking him to the prison.
In transit, he managed to break free when the Templars were attacked by Assassins sent by Ah Tabai, but was chased down by Kenway and escorted to Torres' estate. He was moved later that same day, but escaped soon after and took to the sea.
Roberts eventually began working on board a slave ship called the Princess, captained by Abraham Plumb; this ship made regular trips between Kingston and the Portuguese colony of Príncipe roughly every eight weeks. When the ship was captured by the Welsh pirate Howell Davis, Roberts chose to become a pirate himself. During his time sailing with Howell, he served as Navigator and consultant to the captain. On 19 June 1719, Davis was killed in a Templar-orchestrated ambush at Príncipe, forcing Roberts to go into hiding.
Approached by Kenway once again, the two struck a deal: Kenway would free Roberts' imprisoned crew and kill the Templars John Cockram and Josiah Burgess, in exchange for Roberts leading him to the First Civilization site known as the Observatory; Kenway did as he was asked, recapturing the Princess in the process. Roberts then gave a speech to his crew, declaring his intentions to sail as a pirate, and the two captains returned to the West Indies.
In the following months, Roberts made a name for himself by taking ships and making a fortune. He kept his crew to high standards with an eleven-part creed; it discouraged gambling on the ship, required the men to keep their equipment in good working order, and provided that pirates should live their lives as fully as possible and die before they became weak and old, vulnerable to having their power stripped from them: a philosophy he summed up with the words "a merry life and a short one."
Roberts and Kenway met again off the coast of the Yucatán Peninsula, where they infiltrated a Portuguese camp to steal First Civilization crystal vials that had been imbued with the blood of both pirates and Templars alike. After completing the heist and commandeering the Portuguese flagship, Nosso Senhor da Compreensão, Roberts renamed her to the Royal Fortune. Afterwards, Kenway killed his former comrade Benjamin Hornigold, who had allied himself with the Templars, to ensure the pirates were not followed, before meeting Roberts again at Long Bay, on the northern shore of Jamaica. The two went ashore with four of Roberts's crew in search of the Observatory.
Over the next two years Roberts captured hundreds of ships, earning the attention of both the British and Spanish navies as well as the Templars; he was forced to retreat to Príncipe, where he was found by Kenway. Roberts attempted to flee aboard the Royal Fortune, keeping the Jackdaw at bay with mortar fire and fire barrels, before moving into open waters where Spanish and British forces engaged him.
Eventually the Royal Fortune was disabled by the Jackdaw and boarded. There, Bartholomew Roberts and Edward Kenway fought one another, with Kenway emerging the eventual victor, having impaled Roberts with a rope dart.
Roberts first noted the aptness of his motto before remarking that he may have misjudged Kenway, and perhaps he was indeed the one 'she' had sought. Roberts expressed regret that like many other Sages of his time and before him, he was born too early, and that he did not have the time to open the door to the Temple, confusing Edward, who demanded he talk sense. Roberts did not elaborate, however, requesting only that Edward destroy his body in order to prevent the Templars from gaining anything from it, before succumbing to his injuries. Edward then complied with his final request.
- Roberts acquired his outfit from Howell Davis, the Princess' former captain, after the latter's death at Príncipe.
- Historically, Roberts was known to be one of the few Gentleman Pirates, having established a strict pirate code as a captain. Additionally, he died when he succumbed to an attack by the British Royal Navy ship of the line HMS Swallow. A full broadside unleashed by the Swallow ripped Roberts's throat out with grapeshot, and he was buried at sea by his crew at his own request.
- Also, despite his character, he committed a serious atrocity in the burning of the slave ship, Porcupine, where many innocent sailors and slaves were killed after the crew refused to surrender. This incident is not mentioned by any character in the game, but Edward does recall it while pursuing him in the novelization.
- In real-life, Roberts was one of the most successful pirates of all time, believed to have captured more than 400 ships during his career. He is generally considered the most successful pirate of the Golden Age of Piracy, although the most successful pirate of all time is considered to be Ching Shih of China, a female captain who personally commanded over 300 junks (Chinese ships) with a force of anywhere from 20,000 to 40,000 pirates at any given time. In the Assassin's Creed series, this record is surpassed by the pirate and Assassin Samuel Bellamy, who is estimated to have captured hundreds of millions of dollars worth of gold and treasures in his short career.
- Roberts's mention of a Temple and Juno may have contributed for Edward's later years researching of the Grand Temple and the key that would soon allow Desmond Miles to retrieve it and stop the impending solar flare at 2012.