During the Irish Potato Famine, the poor were hired for useless construction projects called ‘famine follies’ in order to provide them with work that would not take existing work away from other workers. These included roads in the middle of nowhere, between two seemingly random points.
Sucking a king’s nipples was a gesture of submission in ancient Ireland.
Murderers in medieval Ireland were given to the deceased’s family as slaves if they fail to pay a hefty fine to buy their freedom. The family could then legally kill the murderer themselves.
Until 1985, you needed a prescription to buy condoms in Ireland.