Which game introduced Edward Kenway as its main protagonist?

Assassin's Creed IV: Black Flag introduced Edward Kenway as its main protagonist.

Edward is a Welsh privateer who becomes involved with the Assassins and Templars while pursuing wealth and reputation in the Caribbean. The game is set during the Golden Age of Piracy, chiefly in the early eighteenth century.

Black Flag combines land exploration with naval travel and ship combat. Its world includes locations such as Havana, Nassau, and Kingston, while the player upgrades Edward's ship, the Jackdaw.

Edward is the grandfather of Connor Kenway, the protagonist of Assassin's Creed III. This family connection means the two characters share the Kenway name, but they belong to different historical periods and games.