[1][2] He was part of a force of Gauls settled in Pannonia who had advanced to Thrace under a leader called Cambaules.
[citation needed] The Macedonian king, Ptolemy Keraunos, was unconcerned by the approaching army, and declined an offer of 20,000 soldiers from the Dardanians.
[3][4] The Gauls did not follow up their victory, and Sosthenes, a Macedonian nobleman, took command, assembled an army and forced them to withdraw, although he was defeated by Brennus' contingent soon afterwards.
[5][6][7][8] Koch has suggested that Bolgios had become quasi-deified by the Late Iron Age, and the ethnonym of the "Belgae" refers to their claiming ancestry from him.
Their invasion of Britain created an association of noble ancestry being traced back to him, and thus he is also the original figure behind Beli Mawr.