Vere Essex Cromwell, 4th Earl of Ardglass
Vere Essex Cromwell, 4th Earl of Ardglass PC( I),( 2 October 1625 – 26 November 1687) was an English nobleman, son of Thomas Cromwell, 1st Earl of Ardglass and Elizabeth Meverell.
Wingfield Cromwell, 2nd Earl of Ardglass
Wingfield Cromwell, 2nd Earl of Ardglass, DCL, (12 September 1624 – 3 October 1668) was an English nobleman, son of Thomas Cromwell, 1st Earl of Ardglass and Elizabeth Meverell.
He held the subsidiary titles of 2nd Viscount Lecale and 5th Baron Cromwell of Oakham.
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.
Edward Cromwell, 3rd Baron Cromwell
Edward Cromwell, 3rd Baron Cromwell (c. 1560 – 27 April 1607) was an English peer.
He was the son of Henry Cromwell, 2nd Baron Cromwell by his wife Mary, daughter of John Paulet, 2nd Marquess of Winchester and his first wife Elizabeth Willoughby.
His grandfather, Gregory, son of Thomas Cromwell, chief minister to Henry VIII, was created Baron Cromwell on 18 December 1540.
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.
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.
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.
Henry Williams (alias Cromwell)
Sir Henry Williams, alias Cromwell( c. 1537 – 1604) was a knight of the shire( MP) for Huntingdonshire and a grandfather of Oliver Cromwell.
His grandfather, Morgan ap William, was the son of a man named William, and also used the name Williams, but his father abandoned the Welsh patronymic system completely and adopted the name of Cromwell, in honour of an uncle Thomas Cromwell, 1st Earl of Essex.
The family then consistently used and wrote its name as" Williams, alias Cromwell", well into the 17th century.
Thomas Cromwell, 1st Earl of Ardglass
Thomas Cromwell, 1st Earl of Ardglass (11 June 1594 – 1653) was an English nobleman, son of Edward Cromwell, 3rd Baron Cromwell and second wife Frances Rugge.
Thomas Cromwell, 3rd Earl of Ardglass
Thomas Cromwell, 3rd Earl of Ardglass (29 November 1653 – 11 April 1682), was an English nobleman, the only son of Wingfield Cromwell, 2nd Earl of Ardglass of Ilam, Staffordshire and Mary Russell.
He held the subsidiary titles of 3rd Viscount Lecale and 6th Baron Cromwell of Oakham.

Question: Who is Thomas Cromwell, 1St Earl Of Ardglass's paternal grandfather?
Answer: Henry Cromwell, 2nd Baron Cromwell