Vexillarius was one of the signiferi in the Roman legion and was specially protected during combat. He was defended with a small parma shield.
His task was to carry vexillum (pl vexilla), a military banner representing the name and emblem of the legion. The banner consisted of a fabric hanging on the crossbar of a lance or a stick. It was used both in infantry and in riding. The legionary cavalry had banners on a horizontal pole.
Taurus He was strongly associated with Julius Caesar. It is therefore believed that the legions bearing the bull emblem were created by Caesar: III Gallica, IIII Macedonica, V Macedonica, VI Ferrata, VI Victrix, VII Claudia, VIII Augusta, X Fretensis, X Gemina.
Boar on the pennant
Boar Legions: I Italica, II Adiutrix, X Fretensis, XX Valeria Victrix.
Capricorn on the pennant
Capricorn Legions: II Augusta, IIII Macedonica, IIII Scythica, XIV Gemina, XXI Rapax.