Thomas Butler, 6th Viscount Ikerrin
Thomas Butler, 6th Viscount Ikerrin (1683 – 7 March 1719) was an Irish nobleman, born in Kilkenny, Ireland to James Butler, 3rd Viscount Ikerrin and Eleanor Redman, daughter of Colonel Daniel Redman, of Ballylinch, County Kilkenny.
He was a descendant of John Butler of Clonamicklon.
Thomas was a member of the clergy and Chaplain-General to the Army in Flanders.
He married Margaret Hamilton, daughter of James Hamilton of Bangor, County Down and Sophia Mordaunt.
His elder brother Pierce Butler, 4th Viscount Ikerrin, a Brigadier general in the Army, died in 1711, leaving a young son, James, who succeeded as 5th Viscount but died young, whereupon Thomas succeeded to the title.
Somerset Butler, 1st Earl of Carrick
Somerset Hamilton Butler, 1st Earl of Carrick, PC (6 September 1718 – 15 April 1774), known as The Viscount Ikerrin from 1721 to 1744, was the son of Thomas Butler, 6th Viscount Ikerrin and Margaret Hamilton.
He succeeded his brother James Butler as the 8th Viscount Ikerrin on 20 October 1721.
Subsequently, he was invested as a Privy Council of Ireland on 14 April 1746.
He was awarded an LL.D. honorary degree by Dublin University on 23 February 1747.
He was created Earl of Carrick (second creation) on 10 June 1748.
The name "Carrick" refers to the town of Carrick-on-Suir in County Tipperary.
It was also the title of his remote ancestor, Edmund Butler, Earl of Carrick (of the first creation).
Patrick Ruthven, 1st Earl of Forth
Patrick Ruthven, 1st Earl of Forth and 1st Earl of Brentford( c. 1573 – 2 February 1651) was a Scottish nobleman, general, and diplomat.
Somerset Butler, 3rd Earl of Carrick
Somerset Richard Butler, 3rd Earl of Carrick (28 September 1779 – 4 February 1838) was the son of Henry Thomas Butler, 2nd Earl of Carrick and Sarah Taylor.
He succeeded to the title of 3rd Earl of Carrick and 10th Viscount Ikerrin upon his father's death on 20 July 1813.
He was married twice, first on 1 September 1811 to Anne Wynne, daughter of Owen Wynne and Lady Sarah Cole.
They had two children.
He married secondly on 12 February 1833 Lucy French, third daughter of Arthur French, Esquire.
They had three children.
Lord Carrick served as an Irish representative peer from 1819 to 1838.
Henry Butler, 2nd Earl of Carrick
Henry Thomas Butler, 2nd Earl of Carrick (19 May 1746 – 20 July 1813), styled The Honourable from birth to 1748 and then as Viscount Ikerrin between 1748 and 1774, was an Irish peer and politician.
He was the son of Somerset Butler, 1st Earl of Carrick and Lady Juliana Boyle.
Butler held the office of Member of Parliament for Killyleagh in the Parliament of Ireland between 1768 and 1774.
He succeeded to the title of 2nd Earl of Carrick on 15 April 1774.
He died in 1813 at Mount Juliet, County Kilkenny, Ireland.
On 7 August 1774 he married Sarah Taylor, daughter of Colonel Edward Taylor and Anne Maunsell.
Henry Beaufort, 2nd Earl of Somerset
Henry Beaufort, 2nd Earl of Somerset(" probably" 26 November 1401 – 25 November 1418) was the eldest son of John Beaufort, 1st Earl of Somerset, and the grandson of John of Gaunt, 1st Duke of Lancaster and Katherine Swynford.
Henry succeeded his father as Earl of Somerset on 16 March 1410.
During his minority, his mother, Margaret Beaufort, Countess of Somerset held his lands for him until he reached the age of 15.
When Henry was seventeen, he was placed under the command of Thomas Beaufort, Duke of Exeter, his uncle, at the Siege of Rouen during the Hundred Years'
War where he, as well as a number of other nobles, met his demise, although the exact reasons of his death are unknown.
He never married and was succeeded by his younger brother, John Beaufort, 1st Duke of Somerset.
Richard Butler, 1st Earl of Arran
Richard Butler, 1st Earl of Arran, Baron Butler of Cloughgrenan, Viscount Tullough( 15 July 1639 – 25 January 1685 /1686) was an Irish peer, the fourth son of James Butler, 1st Duke of Ormonde.
Joan FitzGerald, Countess of Carrick
Joan FitzGerald, Countess of Carrick( 1281 – 2 May 1320) was an Irish noblewoman, and the wife of Edmund Butler, Earl of Carrick, Justiciar of Ireland( 1268 – 13 September 1321).
She was the mother of James Butler, 1st Earl of Ormond.
Gilbert Talbot, 3rd Baron Talbot
Gilbert Talbot, 3rd Baron Talbot( c. 1332–1387) was an English nobleman and soldier.
He was the grandfather of John Talbot, 1st Earl of Shrewsbury.
Edmund Butler, 11th Viscount Mountgarret
Edmund Butler, 11th Viscount Mountgarret( 27 July 1745 – 16 July 1793) was an Irish peer and politician.
He was the son of Edmund Butler, 10th Viscount Mountgarret and Charlotte Bradstreet, daughter of Sir Simon Bradstreet, 1st Bart.
He married with Henrietta Butler, daughter of Somerset Hamilton Butler, 1st Earl of Carrick on 7 October 1768 and had issued.
He was a Member of Parliament( MP) in the Irish House of Commons for Kilkenny County from 1776 to 1779.

Question: Who is the paternal grandfather of Somerset Butler, 1St Earl Of Carrick?