GALERUS, or GALERUM, diminutive GALERICULUM (probably allied to galea, helmet), in Roman Antiquity, was originally a head-dress worn by priests, but especially by the flamen dialis.1 Its shape was probably a round cap formed of leather, with its top terminating in an apex. In later times the galerus was any kind of cap fitting close to the head like a helmet.2 Galerus, as well as galericulum, also came to signify a peruke, wig, or covering for the head made of hair.3 Flamen dialis solus album habet galerum.4 See AEROGALERUS, vol. ii., p. 449.