Druid Celtic – Brehon Law
Under Druid Celtic Brehon Law (Bretha Nemed Deidenach), the offence of publicising an untrue story which caused shame required payment of the victim’s honour price.
http://www.irishtimes.com/opinion/the-right-to-one-s-good-name-is-as-important-as-freedom-of-expression-1.387960

Druids took very seriously defamation of character.