Jacob was a Roman demigod or legacy in the Fifth Cohort at Camp Jupiter.
The Heroes of Olympus []
The Son of Neptune[]
Jacob is the Eagle bearer, or Aquilifer, of the Twelfth Legion. It's supposed to be a great honor, but given that it involves carrying an empty pole — the Eagle having been lost in Alaska — Jacob is less than thrilled and quite embarrassed by his assignment.
The Blood of Olympus[]
He is seen holding the eagle when Octavian re-enlists Bryce Lawrence, watching with a look of concern on his face. He is also seen holding the eagle when Nico di Angelo, Will Solace, Lou Ellen Blackstone and Cecil Markowitz try to re-calibrate the aim of the onagers toward the other firing lines.
The Trials of Apollo[]
The Tyrant's Tomb[]
He participates in the archery lesson taught by Apollo and does alright. During the battle, he is sprayed with Myrmekes acid and dies. A girl, Terrel, stayed by his side until the end and took over for him when he died.