In Assassin's Creed III, the commonly used name of the Mohawk-British Assassin who opposes the Templars is Connor.
Connor is the name used in the game's English-language presentation for Ratonhnhaké:ton, a member of the Kanien'kehá:ka, also known as the Mohawk. His story unfolds during the American Revolution, and he becomes involved in the conflict after violence threatens his community and homeland.
Connor is trained by Achilles Davenport, a retired Assassin who introduces him to the Brotherhood and its methods. The narrative also follows Connor's father, Haytham Kenway, whose identity and loyalties create a central family conflict.
The answer is sometimes given as Ratonhnhaké:ton, which is Connor's Kanien'kehá:ka name rather than a different character. Haytham is Connor's father and a playable character in the opening section, but he is aligned with the Templars rather than serving as the game's main Assassin protagonist.