Which Assassin's Creed title introduced naval battles and the ship named the Jackdaw?

Assassin's Creed IV: Black Flag introduced the Jackdaw and made naval battles a central part of the Assassin's Creed experience.

The Jackdaw is Edward Kenway's ship, and players use it to travel through the Caribbean, attack other vessels, gather resources, and upgrade their equipment. Naval activity had appeared in Assassin's Creed III, but Black Flag expanded it into a major open-world system.

Assassin's Creed Rogue also features extensive naval gameplay, which can cause confusion. Its main ship is the Morrigan, not the Jackdaw. Black Flag follows the pirate Edward Kenway and is set during the Golden Age of Pir piracy in the early eighteenth-century Caribbean.