The plot is set in a fictional history of real-world events and follows the centuries-old struggle between the Assassins, who fight for peace with free will, and the Templars, who desire peace through control. The framing story is set in the 21st century and depicts the player as an employee of Abstergo Industries (the modern-day incarnation of the Templars), who becomes caught in their conflict with the Assassins. The main story is set in the 18th century Caribbean during the Golden Age of Piracy, and follows notorious Welsh pirate Edward Kenway, grandfather and father of Assassin's Creed III protagonist Ratonhnhaké:ton and antagonist Haytham Kenway, respectively, who stumbles upon the Assassin-Templar conflict.
