we are told, to Rome for satisfaction for the treachery of the envoys, who were three sons of Fabius Ambustus, the chief pontiff. The Romans refused to listen to the claim, and elected the Fabii military tribunes for the ensuing year. Then the Celts abandoned the siege of Clusium and marched straight on Rome. The army showed perfect discipline. There was no indiscriminate plundering and devastation, no city or fortress was assailed. “We are bound for Rome” was their cry to the guards upon the walls of the provincial towns, who watched the host in wonder and fear as it rolled steadily to the south. At last they reached the river Allia, a few miles from Rome, where the whole available force of the city was ranged to meet them. The battle took place on July 18, 390, that ill-omened _dies Alliensis_ which long perpetuated in the Roman calendar the memory of the deepest shame the republic had ever known. The Celts turned the flank of the Roman army, and annihilated it in one tremendous charge. Three days later they were in Rome, and for nearly a year they remained masters of the city, or of its ruins, till a great fine had been exacted and full vengeance taken for the perfidy at Clusium. For nearly a century after the treaty thus concluded there was peace between the Celts and the Romans, and the breaking of that peace when certain Celtic tribes allied themselves with their old enemy, the Etruscans, in the third Samnite war was coincident with the breaking up of the Celtic Empire.(14) Two questions must now be considered before we can leave the historical part of this Introduction. First of all, what are the evidences for the widespread diffusion of Celtic power in Mid-Europe during this period? Secondly, where were the Germanic peoples, and what was their position in regard to the Celts? *Celtic Place-names in Europe* To answer these questions fully would take us (for the purposes of this volume) too deeply into philological discussions, which only the Celtic scholar can fully appreciate. The evidence will be found fully set forth in de Jubainville’s work, already frequently referred to. The study of European place-names forms the basis of the argument. Take the Celtic name _Noviomagus_ composed of two Celtic words, the adjective meaning new, and _magos_ (Irish _magh_) a field or plain.(15) There were nine places of this name known in antiquity. Six were in France, among them the places now called Noyon, in Oise, Nijon, in Vosges, Nyons, in Drôme. Three outside of France were Nimègue, in Belgium, Neumagen, in the Rhineland, and one at Speyer, in the Palatinate.