21st September » Combined English and Irish forces, under the command of Richard de Clare, 2nd Earl of Pembroke Richard de Clare, Earl of Pembroke and Diarmait Mac Murchada Diarmait Mac Murchada, King of Leinster seize Norse-Gaelic Dublin, forcing Ascall mac Ragnaill Asca
29th December » Thomas Becket, Archbishop of Canterbury, is assassinated inside Canterbury Cathedral by followers of Henry II of England known as King Henry II; he subsequently becomes a saint and martyr in the Anglican Communion named Anglican Church and the Catholic Ch