In 390 BC, Celtic warriors defeated the Roman army and sacked Rome, a bold act by a mysterious confederation of tribes that ruled from Britain to Turkey, from Portugal to Poland. Shedding light on this enigmatic yet rather sophisticated culture, anthropologist Alice Roberts takes a journey across Europe to uncover the Celts' origins, their distinctive artwork, and their enduring legacy today. These deeply spiritual peoples were remarkably resilient, but Roberts also details how five centuries of confrontations with Rome led to the almost complete eradication of Celtic culture.