Sir Jacob Frye (born 1847) was a Master Assassin of the British Brotherhood during the Victorian era, and the younger twin brother of Evie Frye. He later became a member of Queen Victoria's's Order of the Sacred Garter, and the grandfather of Lydia Frye, an Assassin active during World War I. Originating from Crawley, Jacob and his sister were raised and trained by their widowed father Ethan in the Assassins' ways. Unlike the studious Evie, Jacob was dismissive of his father's teachings and relied more on his own thoughts and beliefs. This put a strain in his relationship with his father, whom Jacob eventually came to resent. Due to his preference for combat over stealth, he also tended to approach situations head-on and without much forethought, which often put him at odds with Evie due to their conflicting methods. Following his father's death from natural causes in 1868, Jacob, wishing to prove himself to the Brotherhood, accompanied Evie to London, against their superiors' wishes. There, they sought to liberate the city from the Templars' control and help the poverty-stricken masses. To accomplish this, they founded the Rooks, a criminal syndicate that opposed the Templar-backed Blighters. While Evie focused on pursuing a Shroud of Eden, Jacob assassinated various prominent Templars to destroy Grand Master Crawford Starrick's influence within the city. However, his actions often had unintended consequences that negatively affected London and its people, forcing his sister to fix them. Eventually, Jacob became aware of the chaos his reckless actions generated and the flaws in his idea of absolute personal freedom, and began adhering to the Creed's tenents more closely as a result. After he and Evie assassinated Starrick, Jacob stayed in London to rebuild the Brotherhood while his sister married fellow Assassin Henry Green and migrated with him to India. However, in 1888, Jacob sent a summons for his sister after one of his Assassin apprentices went rogue and seized control of the Rooks, using them to terrorize London as Jack the Ripper. Jacob was captured and tortured by Jack, who sought to usurp him as leader of the Brotherhood, but was eventually rescued by Evie after she had killed the Ripper, ending his reign of terror over the city.