Segovesus headed towards the Hercynian Forest, while Bellovesus is said to have led the Gallic invasion of the Po Valley during the legendary reign of the fifth king of Rome, Tarquinius Priscus (616–579 BC), where he allegedly conquered the Etruscans and founded the city of Mediolanum (Milan).
[5][6] Many Greek ceramics and amphoras imported from Massalia, as well as local productions of fine art pottery dated to the second part of the 6th century BC were found on the site of Bourges, which, according to historian Venceslas Kruta, gives archeological credit to the essence of the tradition reported by Livy evoking the power of the people of the region well before his own time.
[5] Kruta further contends that the story "is probably the legendary construction of a 'myth of origins', likely Insubrian, which integrates various elements borrowed from Celtic, Cisalpine and Transalpine traditions, as well as Massaliote and Etrusco-Italian.
"[7] The legend is recounted by the Roman historian Livy in his Ab Urbe Condita Libri, written in the late 1st century BC: While Tarquinius Priscus reigned at Rome, the Celts, who make up one of the three divisions of Gaul, were under the domination of the Bituriges, and this tribe supplied the Celtic nation with a king.
The king, who was now an old man and wished to relieve his kingdom of a burdensome throng, announced that he meant to send Bellovesus and Segovesus, his sister's sons, two enterprising young men, to find such homes as the gods might assign to them by augury; and promised them that they should head as large a number of emigrants as they themselves desired, so that no tribe might be able to prevent their settlement.