[German version] According to Polybius (Pol. 2,22,1; 2,34), the G. were a Gallic tribe, living in the Alps and along the Rhône; G. went into service as mercenaries, hence their name (Pol. 2,22,1). They took part in the Gallic invasion of Italy in 225 BC, but were beaten off, and subsequently defeated in 222 BC.
Gaesum is also the name of a Gallic spear (Caes. B Gall. 3,4), sometimes carried by lightly armed Roman troops (Liv. 8,8,5). In the early Principate, auxiliary troops recruited from Raetia and apparently equipped with this kind of spear were referred to as
gaesati. They were stationed in a fortress within that province under the command of a cavalry veteran (CIL XIII 1081; ILS 2531). Later, a unit described as
vexillatio Retorum Gaesa(torum) is evident in the Scottish Jedbu…