Diarmait Mac Murchada

432 Traditional date for the arrival of St. Patrick in Ireland. 700-800 Irish monasticism reaches its zenith. 795 Full-scale Viking invasion. 1014 Brian Boru/ defeats Vikings at Clontarf, but is murdered. 1169 Dermot MacMurrough, exiled king of Leinster, invites help from 'Strongbow'. 1172 Pope decrees that Hery II of England is feudal lord of Ireland. 1366 Statues of Kilkenny belatedly forbid intermarriage of English and Irish. Gaelic culture unsuccessfully suppressed. 1534-40