On the plus side, the reason is that I've been on holiday, touring round southern Ireland. This was educational for me as Irish history is not one of my strong points. Some highlights:
Waterford: as well as its 'Viking triangle', it boasts a statue of its famous son, Thomas Francis Meagher. Yes, that Meagher, the one who had a hand in designing the Flag of Ireland, was convicted and transported to Tasmania, escaped to the USA, and recruited and led the Irish Brigade in the American Civil War.
Kinsale: Charles Fort. Perfectly preserved C17 star fort, with a decent little museum. Built some decades after the Siege and Battle of Kinsale (1601) which were decisive in completing the English conquest of the island of Ireland, the fort featured in the Williamite conflict in the 1690s and also in the Irish civil war in 1922.
Baltimore (the original one): pretty little fishing village right at the SW corner of Ireland. Something of a tourist hotspot these days. Notable for receiving some very undesirable tourists in 1631 when Barbary corsairs raided and took over 100 inhabitants as slaves. Supposedly the pub we stayed in used to hide IRA weapons under its floor.
Enniscorthy: Battle of Vinegar Hill.