The Nine Years' War (May 1593 – 30 March 1603) was a conflict in Ireland between a confederacy of Irish lords (with Spanish support) and the English-led government. The war was primarily a response to the English Crown's advances into territory traditionally owned by the Gaelic nobility. The war was also part of the Anglo-Spanish War and the European wars of religion.
The Kingdom of Ireland was established as an English client state in 1542, with various clans accepting English sovereignty under "surrender and regrant". By the early 1590s, widespread resentment against English rule developed amongst the Gaelic nobility, due to the execution of Gaelic lords, the pillaging of settlements by appointed sheriffs and Catholic persecution.
