An evocatus was a soldier in the Ancient Roman army who had served out his time and obtained an honorable discharge but had voluntarily enlisted again at the invitation of the consul or other commande
Statue of Jupiter Dolichenus from Carnuntum, erected by Atilius Primus, an evocatus of the Legio XIV Gemina. The dative form ēvocātō is visible at left.
The equites constituted the second of the property/social-based classes of ancient Rome, ranking below the senatorial class. A member of the equestrian order was known as an eques.
Evocatus
…the camp and making roads. Evocati held a higher rank in the army than common legionary soldiers and are sometimes written of in conjunction with the equites Romani, and sometimes classed with the centurions. Evocati appear to have been frequently promoted to the rank of centurion and were customarily entitled to…
A Roman senior officer (centre) of the time of Polybius, as depicted on a bas-relief from the Altar of Cn. Domitius Ahenobarbus, c. 122 BC. Probably a tribunus militum (joint legionary commander), the officer wears a decorated bronze cuirass, pteruges, mantle, and Attic-style helmet with horsehair plume. The sash around his cuirass probably denoted knightly rank. In the republican army, tribuni were elected by the comitia centuriata (main people's assembly) from the members of the equestrian order.
A Roman coin issued during the Second Punic War (218–201 BC) showing (obverse) the god of war Mars and (reverse) probably the earliest image of a Roman cavalryman of the republican era. Helmet with horsehair plume, long spear (hasta), small round shield (parma equestris), and flowing mantle. Roman cavalry was levied from the equites, and from volunteers of the second property class, until the early 1st century BC. Bronze quincunx from Larinum mint.
Picture of an equestrian dressed in his rank toga and tunic, the angusticlavia