The native legend of their migrations, which has been preserved to us mainly by Livy, relates the story of these later retrograde movements as follows.(8) The Gallic confederacy, which was headed then as in the time of Caesar by the canton of the Bituriges (around Bourges), sent forth in the days of king Ambiatus two great hosts led by the two nephews of the king. One of these nephews, Sigovesus, crossed the Rhine and advanced in the direction of the Black Forest, while the second, Bellovesus, crossed the Graian Alps (the Little St. Bernard) and descended into the valley of the Po. From the former proceeded the Gallic settlement on the middle Danube; from the latter the oldest Celtic settlement in the modern Lombardy, the canton of the Insubres with Mediolanum (Milan) as its capital. Another host soon followed, which founded the canton of the Cenomani with the towns of Brixia (Brescia) and Verona. Ceaseless streams thenceforth poured over the Alps into the beautiful plain; the Celtic tribes with the Ligurians whom they dislodged and swept along with them wrested place after place from the Etruscans, till the whole left bank of the Po was in their hands. After the fall of the rich Etruscan town Melpum (presumably in the district of Milan), for the subjugation of which the Celts already settled in the basin of the Po had united with newly arrived tribes (358?), these latter crossed to the right bank of the river and began to press upon the Umbrians and Etruscans in their original abodes. Those who did so were chiefly the Boii, who are alleged to have penetrated into Italy by another route, over the Poenine Alps (the Great St. Bernard): they settled in the modern Romagna, where the old Etruscan town Felsina, with its name changed by its new masters to Bononia, became their capital. Finally came the Senones, the last of the larger Celtic tribes which made their way over the Alps; they took up their abode along the coast of the Adriatic from Rimini to Ancona. But isolated bands of Celtic settlers must have advanced even far in the direction of Umbria, and up to the border of Etruria proper; for stone-inscriptions in the Celtic language have been found even at Todi on the upper Tiber. The limits of Etruria on the north and east became more and more contracted, and about the middle of the fourth century the Tuscan nation found themselves substantially restricted to the territory which thenceforth bore and still bears their name. Attack on Etruria by the Romans