A fragmentary altar to Silvanus was found at Circencester (Corinium) in the 19th century (RIB 104). It was dedicated by [.] Sabidius Maximus.
Anthony Birley has suggested a possible link with M. Sabidiu[s] Ma[ximus] known from an inscription found at Elbasan, Albania, on the route of the strategic Via Egnatia (AE 1937, no. 101) [JSTOR]. He served in various roles, including signifer, in the Legio IX Claudia, then as centurion in the Legio III Gallica (during the reign of Hadrian). Birley suggests that one of the Legions in which he served could be restored as the Legio I[I Augusta] (based at Caerleon).