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The First Cohort of the Twelfth Legion is the most prestigious cohort. The senior Centurion was Octavian, the augur of Camp Jupiter.

The Heroes of Olympus

The Son of Neptune

The First Cohort is mentioned several times. They, along with the Second Cohort, were defeated by the Fifth Cohort during the Roman War Games on Percy Jackson's first night at Camp Jupiter.

Later, when Polybotes went to attack Camp Jupiter with his army, the Fifth and Second Cohort were trying to surround him. However, Polybotes caused the two cohorts to take a severe beating until Percy interfered and eventually defeated him.

Known Members of the First Cohort


  • The first cohort has a reputation of being jerks to the other cohorts.
First Cohort: Octavian | Michael Kahale
Second Cohort: Larry | Ida | Carl | Reza | Lynda
Third Cohort: Hank
Fourth Cohort: Leila | Claudia | Janice | Claudia's Father | Mimi
Fifth Cohort: Dakota | Gwendolyn | Bobby | Jacob | Michael Varus | Jason Grace | Bryce Lawrence | Frank Zhang | Hazel Levesque | Percy Jackson | Lavinia Asimov | Thomas