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

Following the trial and execution of the Lord Deputy of Ireland, Thomas Wentworth, 1st Earl of Strafford, in May 1641, Ireland is in a state of turmoil. There is growing tension between Catholics and Protestants (particularly those of a Puritan tendency) with the former generally sympathetic to King Charles while the latter supports the English Parliament and the Scottish Covenanters in the dispute that shortly leads to the outbreak of the English Civil War. This forms part of the wider War of the Three Kingdoms.

On October 23, a major uprising breaks out in Ulster organised by leading members of the Gaelic aristocracy. The rebels attack Protestant plantation settlements as well as native Irish Protestants and take garrison towns held by the Irish Army. Irish government authorities in Dublin struggle to contain the insurgency with the limited number of troops they have at their disposal. A last-minute warning saves Dublin Castle from a surprise attack, although O’Neill is clearly unaware of the failure of the Dublin plot when he issues his proclamation.

After seizing several key strategic points in Ulster over the previous twenty-four hours, O’Neill makes his proclamation in Dungannon, a town that has symbolic importance as the traditional capital of the O’Neill dynasty.

In support of his actions, O’Neill claims to have a document from King Charles commissioning him. The Commission is supposedly signed under the Great Seal of Scotland. By declaring their loyalty to the Crown and defence of the Catholic religion, O’Neill and his followers adopt a political stance which is taken up by the subsequent Irish Confederation which governs rebel-controlled territory in the name of the King from 1642 until 1649. The Proclamation encourages many Catholics to believe they can lawfully join the rising with the King’s blessing, while Protestants are left demoralised.

O’Neill’s second and more trenchant proclamation is made “from our camp at Newry” on November 4, 1641 alongside Rory Maguire. He also publishes the actual royal commission that gives authority for his earlier proclamation. It is subtly different, in that it empowers him to arrest and seize property from all of Charles’s English Protestant subjects living in Ireland, but exempts his Irish and Scottish subjects.

Until the late nineteenth century historians generally accept that the commission is genuine, or at the very least Charles had secretly encouraged the Irish Catholics to launch a rising. Since then, for a variety of reasons, it has been considered to be a forgery produced by O’Neill and his associates without the knowledge of the King. They may well have acquired a copy of the Great Seal of Scotland when they captured the garrison town of Charlemont on October 23.

The historian David Stevenson notes that it would be unlikely that the commission would have been addressed to O’Neill. Had it been genuine it would almost certainly have been issued to more senior Irish Royalists such as the James Butler, 1st Duke of Ormond, or the leading Catholic noble of Ulster, Randal MacDonnell, 1st Marquess of Antrim. It is also unlikely to have been issued at Edinburgh as O’Neill claimed. However, King Charles was in Edinburgh on October 1, dealing with Scottish political matters.

Forgery or not, King Charles publicly proclaims all the Irish rebels as traitors on January 1, 1642.

That the Commission is genuine is widely accepted in England and Scotland by the King’s opponents and even some of his own supporters. It seems to tie in with earlier rumours of an army plot which had suggested that Charles might bring over the New Irish Army, made up largely of Ulster Catholics, to impose his will on England and Scotland. Anger at the King’s alleged links with the insurgents grow – particularly as horror stories of atrocities committed, such as the Portadown Massacre, begin to filter across the Irish Sea. Tensions arising from news of the Irish rebellion is a factor in the English push to Civil War in early 1642.

The Scottish authorities dispatch an Army which quickly retakes much of Ulster from the insurgents. Once the English Civil War breaks out in October 1642, Charles’ emissaries begin negotiations with the Irish rebels for their support, which seems to present further evidence to his opponents of his links with the Catholic Ulster leaders. Many of these later dealings are exposed when Charles private letters are captured during the Battle of Naseby (1645) and published as King’s Cabinet Opened.

When O’Neill is captured in 1653 following the Cromwellian conquest of Ireland, he is put on trial for his life. The authorities offer to spare him if he will repeat his earlier claims that Charles had ordered the Catholics to rise in 1641. O’Neill now refuses to implicate the King, who had been executed four years earlier, and is put to death himself. Nonetheless, the English Republicans continue to use O’Neill’s earlier claims of the King’s involvement to justify their decision to commit regicide.