Golden Age of the Celts
But we are anticipating, and must return to the period of the origins of Celtic history. As astronomers have discerned the existence of an unknown planet by the perturbations which it has caused in the courses of those already under direct observation, so we can discern in the fifth and fourth centuries before Christ the presence of a great power and of mighty movements going on behind a veil which will never be lifted now. This was the Golden Age of Celtdom in Continental Europe. During this period the Celts waged three great and successful wars, which had no little influence on the course of South European history. About 500 B.C. they conquered Spain from the Carthaginians. A century later we find them engaged in the conquest of Northern Italy from the Etruscans. They settled in large numbers in the territory afterwards known as Cisalpine Gaul, where many names, such as Mediolanum (Milan), Addua (Adda), Viro-dunum (Verduno), and perhaps Cremona (creamh, garlic),3 testify still to their occupation. They left a greater memorial in the chief of Latin poets, whose name, Vergil, appears to bear evidence of his Celtic ancestry.4 Towards the end of the fourth century they overran Pannonia, conquering the Illyrians.
Alliances with the Greeks
All these wars were undertaken in alliance with the Greeks, with whom the Celts were at this period on the friendliest terms. By the war with the Carthaginians the monopoly held by that people of the trade in tin with Britain and in silver with the miners of Spain was broken down, and the overland route across France to Britain, for the sake of which the Phocæans had in 600 B.C. created the port of Marseilles, was definitely secured to Greek trade. Greeks and Celts were at this period allied against Phœnicians and Persians. The defeat of Hamilcar by Gelon at Himera, in Sicily, took place in the same year as that of Xerxes at Salamis. The Carthaginian army in that expedition was made up of mercenaries from half a dozen different nations, but not a Celt is found in the Carthaginian ranks, and Celtic hostility must have counted for much in preventing the Carthaginians from lending help to the Persians for the overthrow of their common enemy. These facts show that Celtica played no small part in preserving the Greek type of civilisation from being overwhelmed by the despotisms of the East, and thus in keeping alive in Europe the priceless seed of freedom and humane culture.
Alexander the Great
When the counter-movement of Hellas against the East began under Alexander the Great we find the Celts again appearing as a factor of importance. In the fourth century Macedon was attacked and almost obliterated by Thracian and Illyrian hordes. King Amyntas II. was defeated and driven into exile. His son Perdiccas II. was killed in battle. When Philip, a younger brother of Perdiccas, came to the obscure and tottering throne which he and his successors were to make the seat of a great empire he was powerfully aided in making head against the Illyrians by the conquests of the Celts in the valleys of the Danube and the Po. The alliance was continued, and rendered, perhaps, more formal in the days of Alexander. When about to undertake his conquest of Asia (334 B.C.) Alexander first made a compact with the Celts “who dwelt by the Ionian Gulf” in order to secure his Greek dominions from attack during his absence. The episode is related by Ptolemy Soter in his history of the wars of Alexander.5 It has a vividness which stamps it as a bit of authentic history, and another singular testimony to the truth of the narrative has been brought to light by de Jubainville. As the Celtic envoys, who are described as men of haughty bearing and great stature, their mission concluded, were drinking with the king, he asked them, it is said, what was the thing they, the Celts, most feared. The envoys replied: “We fear no man: there is but one thing that we fear, namely, that the sky should fall on us; but we regard nothing so much as the friendship of a man such as thou.” Alexander bade them farewell, and, turning to his nobles, whispered: “What a vainglorious people are these Celts!” Yet the answer, for all its Celtic bravura and flourish, was not without both dignity and courtesy. The reference to the falling of the sky seems to give a glimpse of some primitive belief or myth of which it is no longer possible to discover the meaning.6 The national oath by which the Celts bound themselves to the observance of their covenant with Alexander is remarkable. “If we observe not this engagement,” they said, “may the sky fall on us and crush us, may the earth gape and swallow us up, may the sea burst out and overwhelm us.” De Jubainville draws attention most appositely to a passage from the “Táin Bo Cuailgne,” in the Book of Leinster7, where the Ulster heroes declare to their king, who wished to leave them in battle in order to meet an attack in another part of the field: “Heaven is above us, and earth beneath us, and the sea is round about us. Unless the sky shall fall with its showers of stars on the ground where we are camped, or unless the earth shall be rent by an earthquake, or unless the waves of the blue sea come over the forests of the living world, we shall not give ground.”8 This survival of a peculiar oath-formula for more than a thousand years, and its reappearance, after being first heard of among the Celts of Mid-Europe, in a mythical romance of Ireland, is certainly most curious, and, with other facts which we shall note hereafter, speaks strongly for the community and persistence of Celtic culture.9
The Sack of Rome
We have mentioned two of the great wars of the Continental Celts; we come now to the third, that with the Etruscans, which ultimately brought them into conflict with the greatest power of pagan Europe, and led to their proudest feat of arms, the sack of Rome. About the year 400 B.C. the Celtic Empire seems to have reached the height of its power. Under a king named by Livy Ambicatus, who was probably the head of a dominant tribe in a military confederacy, like the German Emperor in the present day, the Celts seem to have been welded into a considerable degree of political unity, and to have followed a consistent policy. Attracted by the rich land of Northern Italy, they poured down through the passes of the Alps, and after hard fighting with the Etruscan inhabitants they maintained their ground there. At this time the Romans were pressing on the Etruscans from below, and Roman and Celt were acting in definite concert and alliance. But the Romans, despising perhaps the Northern barbarian warriors, had the rashness to play them false at the siege of Clusium, 391 B.C., a place which the Romans regarded as one of the bulwarks of Latium against the North. The Celts recognised Romans who had come to them in the sacred character of ambassadors fighting in the ranks of the enemy. The events which followed are, as they have come down to us, much mingled with legend, but there are certain touches of dramatic vividness in which the true character of the Celts appears distinctly recognisable. They applied, 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