Answer:

4. The church synod which led to the Law of the Innocents or Cain Adamnain (Adamnan's Law) was held at Birr (Co Offaly, in the midlands). Called by Adamnan, abbot of Iona and a relation of Columba, it offered protection to women, children and other non-combatants in war. Adamnan was responding to a promise he made to his mother, Ronnat, years earlier.