Henry de Beaumont, 5th Earl of Warwick
Henry de Beaumont, 5th Earl of Warwick( c. 1192 – 10 October 1229), Earl of Warwick, and by marriage Lord of Hocknorton( Hook Norton) and Hedenton( Headington) in Oxfordshire, was the son of Waleran de Beaumont, 4th Earl of Warwick and Margaret.
He was also known as Henry de Newburgh.
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.
Robert de Beaumont, 3rd Earl of Leicester
Robert de Beaumont, 3rd Earl of Leicester( died 1190) was an English nobleman, one of the principal followers of Henry the Young King in the Revolt of 1173 – 1174 against his father Henry II.
He is also called Robert Blanchemains( meaning" White Hands" in French).
Waleran de Beaumont, 1st Earl of Worcester
Waleran de Beaumont, Count of Meulan, 1st Earl of Worcester( 1104 – 9 April 1166, Preaux), was the son of Robert de Beaumont, 1st Earl of Leicester and Elizabeth de Vermandois, and the twin brother of Robert de Beaumont, 2nd Earl of Leicester.
He is not referred to by any surname in a contemporary document other than' Waleran son of Count Robert'.
Roger de Beaumont, 2nd Earl of Warwick
Roger de Beaumont, 2nd Earl of Warwick (c. 1102 – 12 June 1153) was the elder son of Henry de Beaumont, 1st Earl of Warwick and Margaret (d. after 1156), daughter of Geoffroy, Count of Perche and Beatrix of Montdidier.
He was also known as Roger de Newburgh.
The borough of Warwick remembers him as the founder of the Hospital of S. Michael for lepers which he endowed with the tithes of Wedgnock, and other property; he also endowed the House of the Templars beyond the bridge.
He also built the Chapel of St James the Great in Warwick which is now part of the Lord Leycester Hospital
In the reign of King Stephen he founded a priory dedicated to S. Cenydd at Llangennith,
Co. Glamorgan and
he attached it as a cell to the Abbey of S. Taurinus at Evreux in Normandy.
Margaret de Beaumont, 7th Countess of Warwick
Margaret de Beaumont, 7th Countess of Warwick or Margaret de Neubourg or Margery de Newburgh( died 3 June 1253) was the daughter of Henry de Beaumont, 5th Earl of Warwick and Margaret D'Oyly.
She was the sister and heiress of Thomas de Beaumont, 6th Earl of Warwick and became the 7th Countess of Warwick in her own right.
She married firstly John Marshal( died October 1242) and, secondly, John de Plessis.
The latter was a great favourite of King Henry III of England who, in 1247, created him the 7th Earl of Warwick and subsequently Count of Warwick.
He died on 20 February 1263.
There was no issue by either of these marriages and so, at Margaret's death, the estates passed to her cousin, William Mauduit, who became the 8th Earl.
William Mauduit, 8th Earl of Warwick
William Mauduit, 8th Earl of Warwick or William Maudit( c. 1221 – 8 January 1268) was an English nobleman and participant in the Second Barons' War.
He was the son of Lady Alice de Newburgh( daughter of 4th Earl of Warwick from his second wife, Alice de Harcourt) and William de Mauduit, and thus the grandson of Waleran de Beaumont, 4th Earl of Warwick.
His father was Lord of Hanslope and hereditary Chamberlain of the Exchequer, a title that went back to another William Mauduit who held that office for King Henry I of England.
After the death of his half- cousin, Margaret de Beaumont, 7th Countess of Warwick" suo jure" – without issue in June 1253 – he succeeded to the title Earl of Warwick which was passed down to him.
William adhered to King Henry III in the Second Barons' War of 1264 – 67.
During that time, there was a surprise attack on Warwick Castle, his residence, by the forces of Simon de Montfort, 6th Earl of Leicester from Kenilworth Castle, led by John Giffard.
According to 15th- century chronicler John Rous, the walls along the northeastern side of Warwick Castle were destroyed, so" that it should be no strength to the king".
William and his wife were then taken as prisoners to Kenilworth Castle and were held there until the payment of a ransom of nineteen hundred marks was given.
William married Alice de Segrave, daughter of Gilbert de Segrave( son of Stephen de Segrave and his first wife) and Amabil de Chaucombe, but had no issue from the marriage.
When he died, his estates passed to his sister Isabel who had married William de Beauchamp, Lord of Elmley.
Isabel died shortly after her brother, and the title passed to her son William de Beauchamp, 9th Earl of Warwick.
Amice (Countess)
Amice( died 1215) was a Countess of Rochefort and" suo jure" countess of Leicester.
She is associated with England but is thought to have spent most of her life in France.
She was the daughter of Robert de Beaumont, 3rd Earl of Leicester and Petronilla de Grandmesnil.
Waleran de Beaumont, 4th Earl of Warwick
Waleran de Beaumont, 4th Earl of Warwick (1153 – 12 December 1204) was the younger son of Roger de Beaumont, 2nd Earl of Warwick and Gundred de Warenne, daughter of William de Warenne, 2nd Earl of Surrey and Elizabeth de Vermandois.
He was also known as Walerian de Newburg.
After the death of his brother, William de Beaumont, 3rd Earl of Warwick, an impostor arose, claiming to be the deceased Earl; he gave Waleran a great deal of trouble in maintaining his claim.
He does not appear to have been a great soldier, for he paid scutage money to escape military service in Wales.
His position in the Court is attested by his bearing the right hand Sword of State at the Coronation of John, King of England, 27 May 1199.
He liberally supported the hospital of St Michael's Hospital, Warwick and gave to the nuns of Pinley land at Claverdon, and land at Brailes to the nuns at Wroxall, Warwickshire.
William de Beaumont, 3rd Earl of Warwick
William de Beaumont, 3rd Earl of Warwick (before 1140 – 15 November 1184) was an English nobleman.
He was married to Matilda de Percy (†c. 1204), daughter of William de Percy (†1175) and his first wife Alice of Tonbridge (†1148).
He inherited the earldom from Roger de Beaumont, 2nd Earl of Warwick.
On his father's death in 1153, William may have been a minor.
William died, probably on Crusade, in 1184, and was succeeded by his brother Waleran de Beaumont, 4th Earl of Warwick.

Question: Who is William De Beaumont, 3Rd Earl Of Warwick's paternal grandfather?
Answer: Henry de Beaumont, 1st Earl of Warwick