Events

• 12 March - Robert Devereux, 2nd Earl of Essex
  Robert Devereux, 2nd Earl of Essex
  Robert Devereux, 2nd Earl of Essex, KG was an English nobleman and a favourite of Elizabeth I. Politically ambitious, and a committed general, he was placed under house arrest following a poor campaign in Ireland during the Nine Years' War in 1599...
  
  , is appointed Lord Lieutenant of Ireland
  Lord Lieutenant of Ireland
  The Lord Lieutenant of Ireland was the British King's representative and head of the Irish executive during the Lordship of Ireland , the Kingdom of Ireland and the United Kingdom of Great Britain and Ireland...
  
   by Queen Elizabeth I of England
  Elizabeth I of England
  Elizabeth I was queen regnant of England and Ireland from 17 November 1558 until her death. Sometimes called The Virgin Queen, Gloriana, or Good Queen Bess, Elizabeth was the fifth and last monarch of the Tudor dynasty...
  
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• 27 March - Essex leaves London
  London
  London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...
  
   to pursue a military campaign in Ireland
  Essex in Ireland
  Essex in Ireland refers to the military campaign pursued in Ireland in 1599 by Robert Devereux, 2nd Earl of Essex, during the Nine Years War and the Anglo-Spanish War....
  
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• 29 May - Nine Years' War
  Nine Years' War (Ireland)
  The Nine Years' War or Tyrone's Rebellion took place in Ireland from 1594 to 1603. It was fought between the forces of Gaelic Irish chieftains Hugh O'Neill of Tír Eoghain, Hugh Roe O'Donnell of Tír Chonaill and their allies, against English rule in Ireland. The war was fought in all parts of the...
  
  : Essex captures Cahir Castle
  Siege of Cahir Castle
  The Siege of Cahir Castle took place in Munster, in southern Ireland in 1599, during the campaign of the Earl of Essex against the rebels in the Nine Years War . Although the castle was considered the strongest fortress in the country, Essex took it after only a few days of artillery bombardment...
  
   in Munster
  Munster
  Munster is one of the Provinces of Ireland situated in the south of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial purposes...
  
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• 15 August - Nine Years' War: Irish victory over the English at the Battle of Curlew Pass
  Battle of Curlew Pass
  The Battle of Curlew Pass was fought on the 15th of August 1599, during the campaign of the Earl of Essex in the Nine Years' War, between an English force under Sir Conyers Clifford and a rebel Irish force led by Hugh Roe O'Donnell. The English were ambushed and routed while marching through a pass...
  
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• 8 September - Essex in Ireland: Essex signs a truce with Hugh O'Neill. He leaves Ireland against the instructions of Queen Elizabeth.