Events

• Hugh de Lacy the Elder
  De Lacy
  de Lacy is the surname of an old Norman noble family originating from Lassy . The first records are about Hugh de Lacy . Descendent of Hugh de Lacy left Normandy and travelled to England along with William the Conqueror. Walter and Ilbert de Lacy fought in the battle of Hastings...
  
  , 1st Lord of Meath, is assassinated.
• Ruaidrí mac Tairrdelbach Ua Conchobair (often Anglicised Rory O'Connor), The Last High King of Ireland
  High King of Ireland
  The High Kings of Ireland were sometimes historical and sometimes legendary figures who had, or who are claimed to have had, lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of...
  
   (d.1198) was usurped
  Usurper
  Usurper is a derogatory term used to describe either an illegitimate or controversial claimant to the power; often, but not always in a monarchy, or a person who succeeds in establishing himself as a monarch without inheriting the throne, or any other person exercising authority unconstitutionally...
  
  by his son in 1186.