Sir Donough MacCarty, 1st Earl of Clancarty (1594–1665), was an Irish soldier and politician. He succeeded his father as 2nd Viscount Muskerry in 1641. He rebelled against the government and joined the Irish Catholic Confederation, demanding religious freedom as a Catholic and defending the rights of the Gaelic nobility. Later, he supported the King against his Parliamentarian enemies during the Cromwellian conquest of Ireland.

He sat in the House of Commons of the Irish parliaments of 1634–1635 and 1640–1649 where he opposed Strafford, King Charles I's authoritarian viceroy. In 1642, he sided with the Irish Rebellion when it reached his estates in Munster. He fought for the insurgents at the Siege of Limerick and the Battle of Liscarroll. He joined the Irish Catholic Confederates and sat on their Supreme Council. Having fought in the Irish Confederate Wars, he negotiated the Cessation of 1643, a cease-fire between the Confederates and the King. He tried to transform this cease-fire into a permanent peace and was the leader of the Confederates' peace party, which opposed the clerical faction led by Rinuccini, the papal nuncio. Together with President Mountgarret, he negotiated the Glamorgan Peace in 1645, which was disavowed by the King. In 1646 he captured Bunratty Castle from the Parliamentarians and negotiated the First Ormond Peace, which was rejected by Rinuccini, who excommunicated him. During the Cromwellian conquest, he lost the Battle of Knocknaclashy in 1651 but held on until 1652, defending Ross Castle against Edmund Ludlow. He was one of the last to surrender.

In 1653 during the Commonwealth he stood trial for war crimes but was acquitted. In exile on the continent, Charles II created him Earl of Clancarty. He recovered his lands at the restoration of the monarchy in 1660.

Birth and origins Donough MacCarty was born in 1594 in County Cork, most likely at Blarney Castle or Macroom Castle, residences of his parents. He was the second but eldest surviving son of Charles (alias Cormac Oge) MacCarthy and his first wife Margaret O'Brien. His father was at that time known as Sir Charles MacCarthy while his paternal grandfather, Cormac MacDermot MacCarthy, held the title as 16th Lord of Muskerry and owned the ancestral land covering large parts of central County Cork. His father's family were the MacCarthys of Muskerry, a Gaelic Irish dynasty that had branched from the MacCarthy-Mor line in the 14th century when a younger son received Muskerry as appanage.

Donough's mother was the eldest daughter of Donogh O'Brien, 4th Earl of Thomond. Donough was named for this grandfather (there were no Donoughs in the line of the MacCarthy of Muskerry). The name is an anglicised, shortened form of the Gaelic first name Donnchadh. Her family, the O'Briens, were another Gaelic Irish dynasty that descended from Brian Boru, medieval high king of Ireland.

His parents had married about 1590. He was one of seven siblings (two brothers and five sisters). See the list in his father's article.

Religion Although most Irish remained Catholics under the Protestant monarchs Henry VIII and Queen Elizabeth, both of MacCarty's grandfathers were Protestants. His paternal grandfather, Cormac MacDermot MacCarthy, had conformed to the established religion. MacCarty's maternal grandfather, Donogh O'Brien, 4th Earl of Thomond, had been brought up as Protestant at the English court. MacCarty's father seems to have been a Protestant in his youth but later became Catholic.

Early life, marriage, and children When MacCarty's mother died, his father remarried to Ellen Roche. She was the eldest daughter of David Roche, 7th Viscount Fermoy and widow of Donal MacCarthy Reagh of Kilbrittain, who had died in 1636. None of the cited works mentions children from his father's second marriage. MacCarty's stepmother's father was a zealous Catholic but a loyal supporter of the government.

In 1616 MacCarty's father succeeded as the 17th Lord of Muskerry. In 1628 King Charles I created MacCarty's father Baron Blarney and Viscount Muskerry. The titles were probably purchased. They had a special remainder that designated Donough as successor, excluding his elder brother, who was alive at the time but probably had an intellectual disability.

MacCarty married Eleanor Butler some time before 1633 as their eldest son was born in 1633 or 1634. She was a Catholic, the eldest daughter of Thomas Butler, Viscount Thurles. The Butlers were an Old English family descending from Theobald Walter, who came to Ireland during the reign of King Henry II. MacCarty was already in his late thirties while she was about twenty. He had been married before and had a son Donall from this wife, but this earlier marriage seems to have been ignored by his family. His marriage to Eleanor made him a brother-in-law of James Butler, who succeeded as 12th Earl of Ormond in 1633, just before or just after MacCarty's marriage. Ormond was a Protestant, as he had been brought up in England.

Donough and Eleanor had three sons:

Charles (1633 or 1634 – 1665), also called Cormac, predeceased his father, being slain at sea in the Battle of Lowestoft Callaghan (), succeeded his elder brother's infant son, Charles James, as the 3rd Earl of Clancarty Justin ( – 1694), fought for the Jacobites and became Viscount Mountcashel

—and two daughters: Helen (), became countess of Clanricarde. She married 1st Sir John FitzGerald of Dromana and 2ndly William Burke, 7th Earl of Clanricarde. Margaret (), became countess of Fingall by marrying Luke Plunket, 3rd Earl of Fingall

House of Commons When Charles I summoned the Irish Parliament of 1634–1635, MacCarty, already in his forties, stood for County Cork and was elected as one of its two "knights of the shire" as county MPs were then called. He had been knighted in 1634. The Lord Deputy of Ireland, Thomas Wentworth (the future Lord Strafford) asked to vote taxes: six subsidies of £50,000 (equivalent to about £ in ) were passed unanimously. The parliament also belatedly and incompletely ratified the Graces of 1628, in which the King conceded rights for money.

MacCarty was re-elected for County Cork to the Irish Parliament of 1640–1649. The parliamentary records list him as a knight, but about 1638 his father had bought him a baronetcy of Nova Scotia. The King sold these for 3,000 merk Scots each or £166 13s. 4d. sterling (equivalent to about £ in ). Under Strafford's guidance, the parliament unanimously voted four subsidies of £45,000 (equivalent to about £ in ) to raise an Irish army of 9,000 for use against the Scots in the Second Bishops' War.

In April Strafford left Ireland to advise the King during the Short Parliament at Westminster. The Irish Commons saw their chance to complain about Strafford's authoritarian regime. They formed a committee for grievances of which MacCarty was a member. The committee prepared a remonstrance, called the November Petition, which was signed by all its members. The petition was then voted and approved by the Commons. MacCarty also was part of the delegation of 13 MPs that went to London in November to submit the petition to the King. The Lords sent a separate delegation for their grievances. MacCarty's father was part of it.

Viscount Muskerry In February 1641, MacCarty's father, aged about 70, died in London during his parliamentary mission. He was buried in Westminster Abbey. MacCarty succeeded as 2nd Viscount Muskerry. He lost his seat in the Commons where he was replaced by Redmond Roche, an uncle by his stepmother. As his ailing elder brother had died some time before, the title's special remainder did not need to be invoked. In March when Strafford was tried by the English House of Lords, Muskerry gave evidence that Strafford had prevented Irish people from seeing the King. When he came back to Dublin, Muskerry took his seat in the Irish House of Lords.

Irish wars Ireland suffered 11 years of war from 1641 to 1652, which can be divided into the Rebellion of 1641, the Confederate Wars, and the Cromwellian Conquest. This Eleven Year War or Eleven Years War was a theatre of the Wars of the Three Kingdoms, also known as the British Civil Wars.

Rebellion Seeing the King weak and trying to oppose plantations, Sir Phelim O'Neill launched the Rebellion from the northern province of Ulster in October 1641. He pretended, in his Proclamation of Dungannon, to have a royal commission sanctioning his actions. In Munster Muskerry socialised with Richard Boyle, 1st Earl of Cork, an English Protestant established in Ireland, with whom he had opposed Strafford. News of the rebellion reached Lord Cork at a dinner at Castlelyons where David Barry, 1st Earl of Barrymore entertained Muskerry and Cork's son Roger, Lord Broghill. Barrymore was an Irish Protestant and Cork's son-in-law. Muskerry would later oppose Barrymore and Broghill in battle, but in February 1642 Muskerry still sided with Sir William St Leger, Lord President of Munster, against the insurgents. Muskerry offered to raise an armed force of his tenants and dependants to maintain law and order. He and his wife tried to save Protestants fleeing from the insurgents. In January 1642 the Munster insurgents under Maurice Roche, 8th Viscount Fermoy besieged Lord Cork in Youghal.

However, the rebellion was gaining ground, and on 2 March, Muskerry changed sides, to defend the Catholic faith and the King as he explained on 17 March in a letter to Barrymore. Muskerry believed Phelim O'Neill acted under a royal warrant, but the King had already denounced the Irish insurgents as traitors in January. Hearing of his defection, the Irish Parliament declared Muskerry's estates forfeit. He lost the Dublin townhouse that his father had built about 1640, but the government could not seize his Munster estates.

Like many Catholic royalists, Muskerry imagined Charles could be convinced to accept Catholicism in Ireland as he accepted Presbyterianism in Scotland. He was also prompted to take up arms by the atrocities committed by William St Leger against the Catholic population and by the approach of Richard Butler, 3rd Viscount Mountgarret with his rebel army. Muskerry refused to serve under Mountgarret and competed for the leadership in Munster with Fermoy, an uncle by his stepmother. Fermoy had led the rebellion in Munster before Muskerry joined and outclassed him in terms of precedence, but Muskerry was richer. At a meeting of the leaders at Blarney, Garret Barry, a veteran of the Spanish Army of Flanders, was made general of the Munster insurgents' army as a compromise. Muskerry was his second-in-command.

In March and April, Muskerry and Fermoy with 4,000 men unsuccessfully besieged St Leger in Cork City. On 13 April Murrough O'Brien, 6th Baron Inchiquin, an Irish Protestant, lifted the siege by driving the insurgents from their base at Rochfordstown. Muskerry lost his armour, tent, and trunks in this action. He and his lady stayed nearby at Blarney Castle at the time. On 16 May, Muskerry and Fermoy captured Barrymore Castle at Castlelyons, Barrymore's seat. St Leger died on 2 July, and Inchiquin, the vice-president, took over the command of the government forces in Munster.

Siege of Limerick

In May and June 1642, Muskerry, Garret Barry, Patrick Purcell of Croagh, and Fermoy attacked Limerick. The town opened its gates willingly, but the Protestants defended King John's Castle in the Siege of Limerick. They were led by George Courtenay, 1st Baronet, of Newcastle, who was the constable of Limerick Castle.