The Proclamation of Dungannon was a document produced by Sir Phelim O'Neill on 24 October 1641 in the Irish town of Dungannon. O'Neill was one of the leaders of the Irish Rebellion which had been launched the previous day. O'Neill's Proclamation set out a justification of the uprising. He claimed to have been given a commission signed and sealed on 1 October by the King of Ireland Charles I that commanded him to lead Irish Catholics in defence of the Kingdom of Ireland against Protestants who sympathised with Charles' opponents in the Parliament of England.