Jacob Frye is the twin brother and playable lead of Assassin's Creed Syndicate.
Set in London during the Industrial Revolution, Syndicate follows Jacob and his twin sister Evie Frye as they challenge Templar control over the city. Jacob is impulsive and focused on direct action, while Evie is more methodical and concerned with Isu-related mysteries and the Pieces of Eden.
The game was released in 2015. Its London activities include liberating districts, disrupting factories, hijacking trains, and building an Assassin gang called the Rooks. Jacob and Evie can both be played in the main campaign, although some missions specify one sibling.
The question distinguishes Jacob from Evie because both are central protagonists. Henry Green, born Jayadeep Mir, is an Assassin ally and leader in London, but he is not one of the Frye twins.