Mary Woodville
Mary Woodville, Countess of Pembroke( c. 1456–1481) was a sister of Edward IV's Queen consort, Elizabeth Woodville, and of Anthony Woodville, 2nd Earl Rivers.
She later became the first wife of William Herbert, 2nd Earl of Pembroke, by whom she had one daughter.
Richard Herbert (died 1510)
Sir Richard Herbert Kt( died 1510) of Ewyas, Herefordshire, was an English knight, gentleman, landowner, and courtier.
He was an illegitimate son of William Herbert, 1st Earl of Pembroke, and Maud, a daughter of Adam ap Howell Graunt( Gwynn).
Richard had a full brother named George.
Richard Herbert of Ewyas should not be confused with his uncle, Sir Richard Herbert of Coldbrook, a brother of his father, William Herbert, 1st Earl of Pembroke.
Henry Herbert, 9th Earl of Pembroke
Lt.- Gen. Henry Herbert, 9th Earl of Pembroke, 6th Earl of Montgomery( 29 January 16939 January 1749) was an English peer and courtier.
He was the heir and eldest son of Thomas Herbert, 8th Earl of Pembroke( c. 1656 – 1733) and his first wife Margaret Sawyer.
He was styled Lord Herbert from birth until he inherited his father's earldoms of Pembroke and Montgomery in 1733.
Henry Chetwynd-Talbot, 18th Earl of Shrewsbury
Admiral Henry John Chetwynd- Talbot, 18th Earl of Shrewsbury, 18th Earl of Waterford, 3rd Earl Talbot, CB, PC( 8 November 1803 – 4 June 1868), styled Viscount of Ingestre between 1826 and 1849 and known as The Earl Talbot between 1849 and 1858, was a British naval commander and Conservative politician.
Henry Herbert, 17th Earl of Pembroke
Henry George Charles Alexander Herbert, 17th Earl of Pembroke, 14th Earl of Montgomery (19 May 1939 – 7 October 2003), styled Lord Herbert between 1960 and 1969 and often known simply as Henry Herbert, was a British landowner, member of the House of Lords, film director, and producer.
Philip Herbert, 7th Earl of Pembroke
Philip Herbert, 7th Earl of Pembroke, 4th Earl of Montgomery KB( 1652/53 – 29 August 1683) was an English nobleman and politician who succeeded to the titles and estates of two earldoms on 8 July 1674 on the death of his brother William Herbert, 6th Earl of Pembroke.
He was a homicidal maniac and convicted murderer, who has been called" the infamous Earl of Pembroke."
Although the murder of the magistrate Sir Edmund Berry Godfrey, which sparked the Popish Plot, has never been solved, a strong body of evidence points to Pembroke as the killer.
William Herbert, 1st Earl of Pembroke (died 1570)
William Herbert, 1st Earl of Pembroke, 1st Baron Herbert of Cardiff( c. 150117 March 1570) was a Tudor period nobleman, politician, and courtier.
Herbert was the son of Sir Richard Herbert and Margaret Cradock.
His father was an illegitimate son of William Herbert, 1st Earl of Pembroke of the eighth creation( 1468) by his mistress, Maud, daughter of Adam ap Howell Graunt.
William Herbert, 18th Earl of Pembroke
William Alexander Sidney Herbert, 18th Earl of Pembroke, 15th Earl of Montgomery (born 18 May 1978) is an English peer.
He became earl in 2003 following the death of his father, Henry Herbert, 17th Earl of Pembroke.
Marie de St Pol
Marie de St Pol, Countess of Pembroke( c.1303–1377) was the wife of Aymer de Valence, 2nd Earl of Pembroke( c.1275-1324), and is best known as the foundress of Pembroke College, Cambridge.
Richard Marshal, 3rd Earl of Pembroke
Richard Marshal, 3rd Earl of Pembroke( 119116 April 1234), was the son of William Marshal, 1st Earl of Pembroke and brother of William Marshal, 2nd Earl of Pembroke, whom he succeeded to the Earldom of Pembroke and Lord Marshal of England upon his brother's death on 6 April 1231.

Question: Which country William Herbert, 18Th Earl Of Pembroke's father is from?
Answer: British