As King of Scotland, invaded Ireland and Northern England, and since I have Irish heritage, created the Kingdom of Ireland and granted it to my 2nd born son. When I died and was replaced by my 1st born son, my brother had already held Ireland for about 10-15 years, so his armies were pretty massive, but the little rat-bag decided that Ireland wasn't enough, and declared war on me. Now as a new King, as I'm sure you all know, people didn't like me, so i could only raise a small army, but miraculously i was able to call upon my cousin, King of Bohemia and Great Moravia, and field a decent army, which was destroyed by measles and typhus whilst fighting in Ireland, so i had to resort to plan b..... killing my brother and his wife, along with his 4 kids. I probably spent about 5000 gold trying to do this because I couldn't be bothered to plot and my intrigue was low. Eventually they were all dead, save my brother, King of Ireland, and I was bankrupt, so he just re-married and had more kids, and they also inherited a claim on the Kingdom of Scotland. I wasn't happy, all this effort for nothing, and the war was still going, but eventually we agreed to a white peace. Then my brother was killed whilst crusading or something, so I was pretty happy, but that was a bad couple of months for the Mac Giric dynasty.