Post Neolithic ... but staying with the theme of duality.

http://blog.mythicalireland.co[...]ick-was-married-his-wifes.html
(Quote)
Saint Patrick was married - his wife's name was Sheelah and St. Sheelah's Day was celebrated on March 18th
The revelation in today's Irish Times that Saint Patrick had a wife whose name was Sheelah is tremendously exciting for a number of reasons. Shane Lehane, a folklorist from University College Cork (UCC) has discovered pre-Famine references to a widespread belief that Saint Patrick had a wife and that St. Sheelah's Day was celebrated the day after St. Patrick's Day, on March 18th.
Lehane is quoted in the Irish Times as saying "Pre-Famine, if you go back to the newspapers in Ireland they talk not just about Patrick's Day but also Sheelah's Day. I came across numerous references that Sheelah was thought to be Patrick's wife. The fact that we have Patrick and Sheelah should be no surprise. Because that duality, that union of male and female together, is one of the strongest images that we have in our mythology." (end quote)

Happy St. Patrick's Day!