Jacob Frye is the twin who leads the fight to free London from Templar control in Assassin's Creed Syndicate.
Set in London in 1868, Syndicate follows the Assassin twins Jacob and Evie Frye. Jacob is impulsive and focuses on building a street gang called the Rooks, while Evie is more methodical and investigates Pieces of Eden and Templar activity.
Jacob's campaign targets Templar influence across industrial London. The twins recruit allies, challenge criminal and corporate power, and work with Henry Green, an Indian Assassin based in the city. Their missions reflect the social and technological changes of the Victorian era.
Evie is also a playable protagonist, so the game is not exclusively Jacob's story. The question distinguishes the twin who leads the gang-centered campaign from Evie, whose missions emphasize investigation and the search for an Isu artifact.