George Smith (MP for Exeter)
Sir George Smith( died 21 March 1619) of Madworthy- juxta- Exeter and Madford House, Exeter, Devon, was a merchant who served as MP for Exeter in 1604, was three times Mayor of Exeter and was Exeter's richest citizen, possessing 25 manors.
He was the grandfather of George Monck, 1st Duke of Albemarle( 1608- 1670) KG and of John Grenville, 1st Earl of Bath( 1628 – 1701).
Humphrey de Bohun, 2nd Earl of Hereford
Humphrey( IV) de Bohun( 1204 – 24 September 1275) was 2nd Earl of Hereford and 1st Earl of Essex, as well as Constable of England.
He was the son of Henry de Bohun, 1st Earl of Hereford, and Maud FitzGeoffrey.
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.
Robert Stewart, 1st Earl of March
Robert Stewart, 1st Earl of Lennox then 1st Earl of March( c. 152229 March 1586) was a Scottish nobleman of the family of Stewart of Darnley.
Ralph Neville, 3rd Earl of Westmorland
Ralph Neville, 3rd Earl of Westmorland( c. 1456 – 6 February 1499) was an English peer.
He was the grandfather of Ralph Neville, 4th Earl of Westmorland.
Charles Monck, 1st Viscount Monck
Charles Stanley Monck, 1st Viscount Monck, was born in 1754 and died on 9 June 1802.
He was the 1st son of Thomas Monck MP, by his wife Judith Mason, daughter of Robert Mason, of Mason Brook
He was MP for Gorey from 1790 to 1798.
He gained the title of 1st Viscount Monck in 1801 as a reward for voting for the Act of Union (1800).
He had already been created Baron Monck, of Ballytrammon in the County of Wexford, in 1797, also in the Peerage of Ireland.
Henry Monck, 1st Earl of Rathdowne
Henry Stanley Monck, 1st Earl of Rathdowne and 2nd Viscount Monck (26 July 1785 – 20 September 1848), was the son of Charles Monck, 1st Viscount Monck, and Anne Quin.
On 28 July 1806, he married Lady Frances Mary Trench, daughter of William Trench, 1st Earl of Clancarty, and his wife Anne, Countess of Clancarty ("née" Gardiner).
They had 11 daughters.
As he died without male heirs, the earldom became extinct and the viscountcy was inherited by his brother Charles.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Henry Percy, 1st Earl of Northumberland
Henry Percy, 1st Earl of Northumberland, 4th Baron Percy, titular King of Mann, KG, Lord Marshal( 10 November 134120 February 1408) was the son of Henry de Percy, 3rd Baron Percy, and a descendant of Henry III of England.
His mother was Mary of Lancaster, daughter of Henry, 3rd Earl of Lancaster, son of Edmund, Earl of Leicester and Lancaster, who was the son of Henry III.
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.

Question: Who is Henry Monck, 1St Earl Of Rathdowne's paternal grandfather?