Henry I of England
Henry I (c. 1068 – 1 December 1135), also known as Henry Beauclerc, was King of England from 1100 to his death in 1135.
He was the fourth son of William the Conqueror and was educated in Latin and the liberal arts.
On William's death in 1087, Henry's elder brothers Robert Curthose and William Rufus inherited Normandy and England, respectively, but Henry was left landless.
He purchased the County of Cotentin in western Normandy from Robert, but his brothers deposed him in 1091.
He gradually rebuilt his power base in the Cotentin and allied himself with William against Robert.
Present at the place where his brother William died in a hunting accident in 1100, Henry seized the English throne, promising at his coronation to correct many of William's less popular policies.
He married Matilda of Scotland and they had two surviving children, William Adelin and Empress Matilda; he also had many illegitimate children by his many mistresses.
Robert, who invaded in 1101, disputed Henry's control of England; this military campaign ended in a negotiated settlement that confirmed Henry as king.
The peace was short-lived, and Henry invaded the Duchy of Normandy in 1105 and 1106, finally defeating Robert at the Battle of Tinchebray.
Henry kept Robert imprisoned for the rest of his life.
Henry's control of Normandy was challenged by Louis VI of France, Baldwin VII of Flanders and Fulk V of Anjou, who promoted the rival claims of Robert's son, William Clito, and supported a major rebellion in the Duchy between 1116 and 1119.
Following Henry's victory at the Battle of Brémule, a favourable peace settlement was agreed with Louis in 1120.
Considered by contemporaries to be a harsh but effective ruler, Henry skilfully manipulated the barons in England and Normandy.
In England, he drew on the existing Anglo-Saxon system of justice, local government and taxation, but also strengthened it with additional institutions, including the royal exchequer and itinerant justices.
Normandy was also governed through a growing system of justices and an exchequer.
Many of the officials who ran Henry's system were "new men" of obscure backgrounds rather than from families of high status, who rose through the ranks as administrators.
Henry encouraged ecclesiastical reform, but became embroiled in a serious dispute in 1101 with Archbishop Anselm of Canterbury, which was resolved through a compromise solution in 1105.
He supported the Cluniac order and played a major role in the selection of the senior clergy in England and Normandy.
Henry's son William drowned in the "White Ship" disaster of 1120, throwing the royal succession into doubt.
Henry took a second wife, Adeliza of Louvain, in the hope of having another son, but their marriage was childless.
In response to this, he declared his daughter Matilda his heir and married her to Geoffrey of Anjou.
The relationship between Henry and the couple became strained, and fighting broke out along the border with Anjou.
Henry died on 1 December 1135 after a week of illness.
Despite his plans for Matilda, the King was succeeded by his nephew, Stephen of Blois, resulting in a period of civil war known as the Anarchy.
James Bathe
James Bathe( c.1500–1570) was an Irish judge of the Tudor era, who was notable for serving as Chief Baron of the Irish Exchequer for thirty years under four successive monarchs.
He was the grandfather of the 1st Earl of Roscommon, and of the noted musician William Bathe.
Richard de Redvers, 2nd Earl of Devon
Richard de Redvers, 2nd Earl of Devon( died 1162) was Earl of Devon from 1155 until his death and was feudal baron of Plympton in Devon.
He married Denise, one of the daughters and coheiresses of Reginald, Earl of Cornwall.
He was High Sheriff of Devon from 1154 – 1157.
He was the son of Baldwin de Redvers, 1st Earl of Devon and brother of William de Reviers, 5th Earl of Devon.
He was succeeded by his son Baldwin de Redvers, 3rd Earl of Devon( died 1188).
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.
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.
Reginald de Dunstanville, 1st Earl of Cornwall
Reginald de Dunstanville (c. 1110 – 1 July 1175) ("alias" Reginald FitzRoy, Reginald FitzHenry, Rainald, etc.
, French: Renaud de Donstanville or de Dénestanville) was an Anglo-Norman nobleman and an illegitimate son of King Henry I (1100–1135).
He became Earl of Cornwall and High Sheriff of Devon.
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.
Thomas Boleyn, 1st Earl of Wiltshire
Thomas Boleyn, 1st Earl of Wiltshire, 1st Earl of Ormond, 1st Viscount Rochford( c. 1477 – 12 March 1539), of Hever Castle in Kent, was an English diplomat and politician who was the father of Anne Boleyn, Queen Consort and the second wife of King Henry VIII, and was thus the maternal grandfather of Queen Elizabeth I of England.
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.
Thomas Pitt
Thomas" Diamond" Pitt( 5 July 1653 – 28 April 1726) of Stratford in Wiltshire and of Boconnoc in Cornwall, was an English merchant involved in trade with India who served as President of Madras and six times as a Member of Parliament.
He was the grandfather of William Pitt, 1st Earl of Chatham(" Pitt the Elder") and was great- grandfather of Pitt the Younger, both prime ministers of Great Britain.

Question: Who is Reginald De Dunstanville, 1St Earl Of Cornwall's paternal grandfather?
Answer: William the Conqueror