Jacob was a werewolf who joined the Thronnos Rokke Clan shortly before Narcissus in Chains and soon became Richard's third-in-command behind Sylvie. Jacob wanted to become the Ulfric and continuously undermined Richard's rule. Anita executed Jacob after Richard made her the Bolverk of the pack.
In Narcissus in Chains the third-in-command is called Geri, even if that has previously been established as the title of the second in line. The third in charge has previously been called Freki. This article assumes this swapping of titles is by mistake and uses the previously established terminology.