Sir Phelim Roe O'Neill of Kinard was an Irish politician and soldier who started the Irish rebellion in Ulster on 23 October 1641. He joined the Irish Catholic Confederation in 1642 and fought in the Wars of the Three Kingdoms under his cousin, Owen Roe O'Neill, in the Confederate Ulster Army. After the Cromwellian conquest of Ireland O’Neill went into hiding but was captured, tried and executed in 1653.

The Irish Rebellion of 1641 was an uprising by Catholics in Ireland, whose demands included an end to anti-Catholic discrimination, greater Irish self-governance, and return of confiscated Catholic lands. Its timing was partially driven by the dispute between Charles I and his opponents—the English Parliamentarians and Scottish Covenanters—which the rebels feared would lead to an invasion and further anti-Catholic measures. Beginning as an attempted coup d'état by Catholic gentry and military officers, it developed into a widespread rebellion and ethnic conflict with English and Scottish Protestant settlers. It led to the 1641–1653 Irish Confederate Wars, part of the Wars of the Three Kingdoms, with up to 20% of the Irish population becoming casualties.