Vexillarius can mean one of three things: First, a vexillarius or vexillifer was one of the signiferi in a Roman legion. His duty was to carry the vexillum, a military standard displaying the name and emblem of the legion. This standard consisted of a woven fabric banner, hung on a crossbar attached to a pole or lance. It was used by both infantry and cavalry. It could designate a vexillation (Latin: vexillatio), a detachment from a larger unit, though it was most likely also a standard for regular complete or component units (such as legions, cohorts, alae).