The Celtic Revolution by Simon Young (Gibson Square, £7.99) Of

all the peoples of Europe, none are so much wrapped in mystery as the Celts, and yet so well-known.
The term was invented by Edward Lhuyd, director of the Ashmolean Museum, around 1700, when he noticed similarities between the old languages of Ireland, Wales, Scotland and France.
The word itself came from Greek and Roman generic terms for barbarians, and was also applied to the ancient civilisation that spanned central Europe at the time of the Roman conquest. But whether these were the same people is disputed.
One thing we do know is that the Celtic influence on European culture was significant, from the early Roman days to its final collapse, when Celtic Christianity saved Europe.
This is a well-written, lively and entertaining read.
Ed West