Diarmait
Diarmait Mac Murchada was King of Leinster from 1127. By 1166 he had been driven out by a coalition under Ruaidrí Ua Conchobair, the High King - there was a stolen wife somewhere in the back of it, the Abbess of Kildare, his neighbour Tighearnán Ua Ruairc nursing the grudge for fifteen years. Diarmait sailed for Bristol, found Henry II in Aquitaine, got a letter of permission, and recruited Richard de Clare - Strongbow - with the offer of his daughter Aoife in marriage and the kingdom after his death. The Normans landed in Wexford in May 1169. By 1171 Diarmait was dead and buried in the cathedral graveyard at Ferns and Strongbow was Lord of Leinster. The high cross shaft in the graveyard is reputed to mark his grave. The story Irish schoolchildren learn - that he sold the country - is the simple version. The slightly less simple version is that he played a regional power game and the table tilted.