Evocati Prefect

[Cipher]

Hi.
I have several questions regarding Evocati Prefect and Evocati which I couldn't find any answers(yes, I saw Rome :? ).

:Were Evocati formed into a unit or were they dispersed throughout the Legion? If they were formed into a unit, would they be placed in the 1st cohort?
id Evocati Prefect led a unit in battle or did he act as a adviser of the commander?
:Was Evocati Prefect a military rank or a title? e.g. would it have been possible to be both a Evocati Prefect and a Primus Pilus leading the 1st cohort?
:Could they retire when they desired? Or did they need a approval of the commander?

Thanks for the help in advance, Edward.

[D B Campbell]

Under the military system of the Republic, evocati ("those who are summoned") were time-served legionaries who were required by their commander to continue their service, probably on account of an emergency (e.g. Catiline calling upon evocati for Pistoria; Pompey calling upon evocati for Pharsalus).

See Ross Cowan's article in Ancient Warfare 2007-2 ("The real Pullo and Vorenus").

Cicero, in a letter of 51 BC, refers to one Decimus Antonius, praefectus evocatorum. Perhaps, wherever evocati were assembled, they were placed under the command of a prefect.

The concept changed somewhat under the system of the Empire, when evocati Augusti were explicitly time-served Praetorians, called upon to perform some specialist function, most commonly as a legionary centurion.

[Cipher]

Under the military system of the Republic, evocati ("those who are summoned") were time-served legionaries who were required by their commander to continue their service, probably on account of an emergency (e.g. Catiline calling upon evocati for Pistoria; Pompey calling upon evocati for Pharsalus).

See Ross Cowan's article in Ancient Warfare 2007-2 ("The real Pullo and Vorenus").

Cicero, in a letter of 51 BC, refers to one Decimus Antonius, praefectus evocatorum. Perhaps, wherever evocati were assembled, they were placed under the command of a prefect.

The concept changed somewhat under the system of the Empire, when evocati Augusti were explicitly time-served Praetorians, called upon to perform some specialist function, most commonly as a legionary centurion.

Thank you.
So would that mean that the role of praefectus evocatorum in the late republic is unknown?
And when the Evocati were assembled, do we know if they formed a unit of their own or if they were dispersed among the cohorts of the legion?