REGNUM (anc. geog.), a town of the Regni, a people in Britain, next the Cantii, now Surry, Suffex, and the coast of Hampshire, (Camden); a town situated, by the Itinerary numbers, on the confines of the Belgæ, in a place now called Ringwood, in Hampshire, on the rivulet Avon, running down from Salisbury, and about ten miles or more distant from the sea.