Who was a famous Celt King?

One famous Celt king was Vercingetorix, the chieftain of the Arverni tribe in what is now France. He is best known for uniting various Gallic tribes in a significant resistance against Julius Caesar during the Gallic Wars. Vercingetorix's leadership culminated in the Battle of Gergovia and ultimately the siege at Alesia, where he was defeated and captured in 52 BCE. His legacy symbolizes the struggle for independence and resistance against Roman conquest.