Praetor

A praetor is a Roman commander of an army in the time of Ancient Rome. There can only be two praetors per legion that act as the effective leaders in all of the legion's affairs, especially during battle. The only known surviving legion is the Twelfth Legion Fulminata and as such there are currently only two praetors, Reyna and Percy Jackson.

The Lost Hero
Prior to the events of the book, Jason Grace declares during the battle against Porphyrion that he is the praetor of the First Legion. However, the First Legion directly pertains to the original Roman legion. Reasons for the title have not yet been explained. He slowly regains his memory and remembers the demigods from his cohort including Hazel Levesque and his co-praetor, Reyna.

The Son of Neptune
It is explained in greater detail that Jason Grace had become praetor after his successful defeat of Krios. This brought honor back to the Fifth Cohort, of which Jason was a part of. One month later, during the events of The Lost Hero, Jason was swapped with Percy Jackson by Hera who planned to unite the two camps. Octavian, having no progress as to Jason's status, took the opportunity to question Reyna's decision to not proclaim another praetor to replace Jason. Reyna, knowing that Camp Jupiter was to be attacked by Polybotes, decided that if by the Feast of Fortuna, Jason does not appear, a new praetor can be elected.

Upon returning from the quest to release Death, reacquiring the Roman standard and defeating Alcyoneus, Percy returns to camp, along with Hazel and Frank, as the standard bearer. Upon Percy's defeat of Polybotes, the Romans raise him on a shield and proclaim him praetor. As his first decision in the senate, Percy orders that Camp Jupiter stand ready upon the arrival of the Argo II, to greet his old friends, the Greeks.

List of Known Praetors

 * Michael Varus (deceased in the 80s)
 * Jason Grace (formerly)
 * Reyna (currently)
 * Percy Jackson (currently)

Trivia

 * The symbol of a praetor is an eagle medal and a purple cape.
 * The Fifth Cohort has housed three out of the four known praetors: Jason Grace, Percy Jackson, and Michael Varus.