This Boudica lady was a pagan who went full Vlad the Impaler on Romans invading her island. The Romans claim to have defeated her army, but still fled the island in terror and never resettled it, so I think Boudica was never defeated.
Boudica got stripped naked and publicly beaten and whipped in the street by Romans, before personally being elected to lead and form an army or revenge, with which she went on to torture the shit out of Roman citizens and wage war against their armies.
https://en.wikipedia.org/wiki/Boudica
https://m.youtube.com/watch?v=npwM2touF08