Ancient Picts - Pictish warriors often painted their bodies with a blue dye from a plant called "Woad". The woad would be painted in different shapes, such as animal. They were very fierce fighters, and the Romans feared them. Sometimes Celtic warriors would enter battle wearing nothing but woad and a necklace. This necklace would supposedly hold healing powers.
The Celtic Warrier Queen Boudica, (also known as Boadicea and known in Welsh as Buddug) was queen of the British Iceni tribe and led an uprising against the occupying forces of the Roman Empire after the Romans broke a treaty and gang raped Boadicca's daughters. She burned Londinium to the ground and slaughtered a Roman army in 60 AD.
Boudicca - Queen of the Iceni Celts under Roman rule. When her husband, King Prasutagus, died in 60AD, the Romans reneged on an earlier agreement & demanded Boudicca hand over her land & wealth. She refused & the Romans beat her & raped her daughters. In turn, Boudicca amassed & led a force of 100,000 warriors against the Roman army & very nearly defeated them... her army sacked London and held the Romans at bay for over 6 months... longer than any other military leader ever...
Boudicca, Celtic warrior queen, lead a major uprising that nearly caused the Romans to retreat from what is now England. She rode into battle on a chariot with her grown daughters fighting at her side.