This study presents a global view on the early Celtic experiment in gender equality, focusing on pre-Roman Celtic groups (Celtiberi, British, Gaulish) as well as the six major Celtic societies which survived into the Middle Ages (Breton, Cornish, Irish, Manx, Scottish, and Welsh). The text employs an interdisciplinary approach avoiding parochialism by cross-referencing, where possible among Pagan, secular Christian, and Christian Church authors. In the cases of conflicts in dates, many types of evidence from varied disciplines such as, archaeology, history, anthropology, comparative law, economics, linguistics, and psychology are cited.