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Sir Thomas Butler, 1st Baronet of Cloughgrenan (c.1578–1642), was an Irish nobleman, the illegitimate son of Sir Edmund Butler of Cloughgrenan (1534-c.1585) and grandson of James Butler, 9th Earl of Ormond and 2nd Earl of Ossory (c.1496-1546).
Sir Thomas was High Sheriff of Carlow for 1612 and 1622. On 16 August 1628, he was created a Baronet of Cloughgrenan (a townland near Carlow, Ireland) by King Charles I (1600–1649). He was a Member of Parliament for Carlow County in the Irish House of Commons between 1634 and 1635, and again from 1639 until his death in 1642
His father, Sir Edmund, had three other legitimate sons with his wife, Eleanor Eustace, the second daughter of Rowland Eustace, 2nd Viscount Baltinglass: Pierce, James and Theobald. The two elder sons (Sir Thomas's half-brothers) were executed by their own uncle, Thomas Butler, 10th Earl of Ormond (c.1531-1614), at Thurles, Ireland, during their rebellion in 1596. The third son, Theobald, was created Viscount Butler of Tulleophelim.
In 1569, Sir Edmund Butler led the Butler Revolt in direct response to the Lord Deputy of Ireland, Sir Henry Sidney, who unjustly granted Sir Edmund's lands in Idrone, Carlow, to the English adventurer Sir Peter Carew. Sir Edmund’s behaviour landed him in the gaol at the Dublin Castle, from which he then escaped. The escape was completed with the help of Fiach McHugh O'Byrne (1534-1597), Lord of Ranelagh and leader of the Clann Uí Bhroin, after which Sir Edmund made his way to Glenmalure.
According to Emmett O’Byrne’s entry on Fiach MacHugh O’Byrne in The Dictionary of Irish Biography, Sir Edmund remained at Glenmalure for some time, during which he had an affair with Fiach's first wife Sadhbh, resulting in her divorce from Fiach, "her later marriage to Butler, and considerable enmity between the two men".  Sadhbh was a daughter of Donall McCahir, chief of the sept of the Kavanaghs (Caomhánach) of Garryhill, and a great-great-granddaughter of Murrough Ballach Kavanagh, late 15th-century King of Leinster. Emmett O’Byrne believes Sadhbh bore Sir Edmund a son, Thomas, who became the 1st Baronet of Cloughgrenan. 
The Cloughgrenan lineage survives to the present day through the line of the Butler Baronets, Sir Richard Pierce Butler, 13th Baronet (b. 1940), and his heir apparent Thomas Pierce Butler (b. 1966), as well as through his younger cousin, James Richard Henry Ormonde Brooke (b. 1972) (great-great-grandson of Captain William C. Butler (1844-1914)), who were all educated at Eton.
Pierce Butler (1744-1822), one of the Founding Fathers of the United States, was the third son of Sir Richard Butler, 5th Baronet of Cloughgrenan (1699–1771), thus being a direct descendant of Sir Thomas Butler, 1st Baronet.
The current family seat is the Ballintemple estate in County Carlow, Ireland. 
Sir Thomas married Anne Bagenal (née Colclough), daughter of Sir Thomas Colclough, with issue: Sir Edmund Butler, 2nd Baronet of Cloughgrenan (died before 1653).
Piers Butler, 8th Earl of Ormond, 1st Earl of Ossory also known as Red Piers, was from the Polestown branch of the Butler family of Ireland. In the succession crisis at the death of Thomas Butler, 7th Earl of Ormond he succeeded to the earldom as heir male, but lost the title in 1528 to Thomas Boleyn. He regained it after Boleyn's death in 1538.
Fiach mac Aodha Ó Broin was Chief of the Name of Clann Uí Bhroin and Lord of Ranelagh during the Elizabethan wars against the Irish clans.
Sir Walter Butler, 11th Earl of Ormond and 4th Earl of Ossory (1559–1633), succeeded his uncle the 10th earl, in 1614. He was called "Walter of the Beads" because he was a devout Catholic, whereas his uncle had been a Protestant. King James I intervened and awarded half of the inheritance to his uncle's Protestant daughter Elizabeth. Ormond contested the King's decision and was for that detained in the Fleet Prison from 1619 until 1625 when he submitted to the King's ruling. He then found a means to reunite the Ormond estate, by marrying his grandson James, who had been raised a Protestant, to Elizabeth's only daughter.
James Butler, 9th Earl of Ormond and 2nd Earl of Ossory, known as the Lame, was in 1541 confirmed as Earl of Ormond thereby ending the dispute over the Ormond earldom between his father, Piers Butler, 8th Earl of Ormond, and Thomas Boleyn, 1st Earl of Wiltshire. He died from poison in London.
Viscount Butler of Tulleophelim, in the County of Carlow, was a title in the Peerage of Ireland. It was created on 4 August 1603 for Theobald Butler, the son of Sir Edmund Butler of Cloughgrenan, second son of James Butler, 9th Earl of Ormond. He later served as Lord Lieutenant of Carlow. The title became extinct on his death in 1613. Tulleophelim is a civil parish located in County Carlow. The parish contains the town of Tullow. The name is contracted from Tullow-offelimy, or hill of the territory of the Hy Felimy, a tribe descended and named from Felimy, son of Enna Kinsella, Kings of Leinster in the fourth century.
Earl of Carrick, in the barony of Iffa and Offa East, County Tipperary, is a title in the Peerage of Ireland.
There have been four baronetcies created for persons with the surname Butler; two in the Baronetage of Ireland and two in the Baronetage of the United Kingdom. As of 2014 two of the creations are extant.
James FitzEustace of Harristown, 3rd Viscount Baltinglass (1530–1585) James FitzEustace, the eldest son of Rowland Eustace, 2nd Viscount Baltinglass and Joan, daughter of James Butler, 8th Baron Dunboyne. He was born in 1530 and died in Spain in 1585. Baltinglass's family was traditionally associated with the FitzGerald family, the earls of Kildare, but prudently remained loyal to Henry VIII during the "Silken Thomas" Rebellion of 1534–35. For their loyalty, they were granted additional lands. Later in the 1540s Thomas FitzEustace, James's grandfather, was created first Viscount Baltinglass by a grateful king. But like many other old English Pale families, the FitzEustaces later became disillusioned.
Sir Thomas Butler, 3rd Baronet of Cloughgrenan, was an Irish baronet and politician.
Sir Pierce Butler, 4th Baronet of Cloughgrenan, PC (Ire) was an Irish politician and baronet.
Sir Richard Butler, 5th Baronet was an Irish politician and baronet.
Sir Edmund Butler of Cloughgrenan, was an Irish noble and the second son of James Butler, 9th Earl of Ormond and Lady Joan Fitzgerald. He was a scion of the House of Ormond, and a rebel against the Tudors.
Thomas Butler, Viscount Thurles was the son and heir apparent of Walter Butler, 11th Earl of Ormond, whom he predeceased. He lived at the Westgate Castle in Thurles, County Tipperary. He was the father of the Irish statesman and Royalist commander James Butler, 1st Duke of Ormonde.
Butler is the name of a noble family whose members were, for several centuries, prominent in the administration of the Lordship of Ireland and the Kingdom of Ireland. They rose to their highest prominence as Dukes of Ormonde. The family has produced multiple titles such as Baron Cahir, Baron Dunboyne, Viscount Ikerrin, Viscount Galmoye, Viscount Mountgarret, Viscount Thurles, Earl of Carrick, Earl of Kilkenny, Earl of Ormond, Earl of Ossory, Marquess of Ormonde and Duke of Ormonde. Variant spellings of the name include le Boteler and le Botiller. The Butlers were descendants of Anglo-Norman lords who participated in the Norman invasion of Ireland in the 12th century. The surname has its origins in the hereditary office of "Butler (cup-bearer) of Ireland", originating with Theobald Walter, 1st Chief Butler of Ireland. The arms of later family members depicted three cups in recognition of their original office.
Sir Edmund Butler, 2nd Baronet, of Cloughgrenan, was the son of Sir Thomas Butler, 1st Baronet and Anne Colclough. He was admitted to Lincoln's Inn on 5 June 1637. He succeeded to the title after 1639. He died intestate and his estate was administered to his widow in 1653.
Colonel Thomas Butler of Garryricken, also known as Thomas Butler of Kilcash was an Irish Jacobite soldier. He commanded a regiment, Thomas Butler's foot, during the Williamite War and fought at the Battle of Aughrim in 1691 where he was taken captive. His son John would, de jure, become the 15th Earl of Ormond.
The High Sheriff of Carlow was the British Crown's judicial representative in County Carlow, Ireland from the 14th century until 1922, when the office was abolished in the new Free State and replaced by the office of Carlow County Sheriff. The sheriff had judicial, electoral, ceremonial and administrative functions and executed High Court Writs. In 1908, an Order in Council made the Lord-Lieutenant the Sovereign's prime representative in a county and reduced the High Sheriff's precedence. However, the sheriff retained his responsibilities for the preservation of law and order in the county. The usual procedure for appointing the sheriff from 1660 onwards was that three persons were nominated at the beginning of each year from the county and the Lord Lieutenant then appointed his choice as High Sheriff for the remainder of the year. Often the other nominees were appointed as under-sheriffs. Sometimes a sheriff did not fulfil his entire term through death or other event and another sheriff was then appointed for the remainder of the year. The dates given hereunder are the dates of appointment. All addresses are in County Carlow unless stated otherwise.
Cloughgrenan is a historic geographic location in Ireland which gives its name to two townlands in county County Laois and one in County Carlow, spanning a total area of 2,354 acres (9.53 km2).
Events from the year 1580 in Ireland.
Theobald Butler, 1st Viscount Butler of Tulleophelim, was an Irish peer.
• Hughes, James (1870). "Sir Edmund Butler of the Dullogh, Knight". The Journal of the Royal Historical and Archaeological Association of Ireland. 1 (1): 153–231. JSTOR 25506579.
• An History of the Life of James Duke of Ormonde from His Birth 1610 to His Death 1688, Thomas A. Carte, M.A. 6 vols. Oxford, 1851
• The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom Extant, Extinct, or Dormant, G. E. Cokayne et al.