Sir Rory O'Moore () (c. 1600 – 16 February 1655), also known Sir Roger O'Moore or O'More or Sir Roger Moore, was an Irish landowner of ancient lineage, and is most notable for being one of the four principal organizers of the Irish Rebellion of 1641. Early life O'Moore belonged to an ancient Irish noble family descended from Conall Cernach. He was born in either Laois around 1600, or more likely at Balyna, his father's estate in County Kildare. O'Moore's uncle Rory O'More, Lord of Laois, had fought against the English during the Tudor conquest of Ireland. In 1556 Queen Mary I confiscated the O'Mores' lands and created "Queens County" (modern-day County Laois). Over 180 family members, who were peaceful and had taken no part in any rebellion, were murdered with virtually all of the leaders of Laois and Offaly by the English at a feast at Mullaghmast, County Kildare in 1577, Rory Óg and his wife Maighréad O'Byrne, sister of Fiach MacHugh O'Byrne, were hunted down and killed soon afterwards. This led to the political downfall of the O'Moore family; their estates were given to English settlers. Leader of the Rebellion of 1641 Given the causes of the rebellion and the Crown's weakness during the Bishops' Wars into 1641, O'More planned a bloodless coup to overthrow the English government in Ireland. With Connor Maguire, 2nd Baron of Enniskillen he planned to seize Dublin Castle, which was held by a small garrison, on 23 October 1641. Allies in Ulster led by Sir Phelim O'Neill would seize forts and towns there. The leaders would assume the governing of their own country and with this provision offer allegiance to King Charles. They were betrayed, and the plan was discovered on 22 October and the rising failed in its first objective. O'Neill had some success, and O'More quickly succeeded in creating an alliance between the Ulster Gaelic clans and the Old English gentry in Leinster. In November 1641 the Irish forces besieged Drogheda and a royalist force came north from Dublin to oppose them. O'More was one of the leaders of the rebel army that intercepted and defeated the relief force at the Battle of Julianstown on 29 November. In the ensuing Irish Confederate Wars, a major achievement by O’Moore was to recruit Owen Roe O'Neill from the Spanish service in 1642. He commanded the Confederate forces in what is now County Laois