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.
John Seymour, 19th Duke of Somerset
John Michael Edward Seymour, 19th Duke of Somerset,( born 30 December 1952), styled Lord Seymour between 1954 and 1984, is a British aristocratic landowner in Wiltshire and Devon, and a member of the House of Lords.
John of Gaunt
John of Gaunt, Duke of Lancaster (6 March 1340 – 3 February 1399) was an English prince, military leader, and statesman.
He was the third of the five sons of King Edward III of England who survived to adulthood.
Due to his royal origin, advantageous marriages, and some generous land grants, Gaunt was one of the richest men of his era, and an influential figure during the reigns of both his father, Edward, and his nephew, Richard II.
As Duke of Lancaster, he is the founder of the royal House of Lancaster, whose members would ascend to the throne after his death.
His birthplace, Ghent, corrupted into English as "Gaunt", was the origin for his name.
When he became unpopular later in life, scurrilous rumours and lampoons circulated that he was actually the son of a Ghent butcher, perhaps because Edward III was not present at the birth.
This story always drove him to fury.
John's early career was spent in France and Spain fighting in the Hundred Years' War.
He made an abortive attempt to enforce a claim to the Crown of Castile that came through his second wife, and for a time styled himself as King of Castile.
As Edward the Black Prince, Gaunt's elder brother and heir to the ageing Edward III, became incapacitated due to poor health, Gaunt assumed control of many government functions, and rose to become one of the most powerful political figures in England.
He was faced with military difficulties abroad and political divisions at home, and disagreements as to how to deal with these crises led to tensions between Gaunt, the English Parliament, and the ruling class, making him an extremely unpopular figure for a time.
John exercised great influence over the English throne during the minority of King Richard II, and the ensuing periods of political strife.
He mediated between the king and a group of rebellious nobles, which included Gaunt's own son and heir, Henry Bolingbroke.
Following Gaunt's death in 1399, his estates and titles were declared forfeit to the Crown, and his son, now disinherited, was branded a traitor and exiled.
Henry Bolingbroke returned from exile shortly after to reclaim his inheritance, and deposed Richard.
He reigned as King Henry IV of England (1399–1413), the first of the descendants of John of Gaunt to hold the English throne.
The House of Lancaster would rule England from 1399 until the time of the Wars of the Roses, when the English crown was disputed with the House of York (formed by the descendants both of his younger brother Edmund, Duke of York and his elder brother, Lionel, Duke of Clarence).
Gaunt also fathered five children outside marriage: one early in life by a lady-in-waiting to his mother, the others by Katherine Swynford, his long-term mistress and third wife.
They were later legitimised by royal and papal decrees, but which did not affect Henry IV's bar to their having a place in the line of succession.
Gaunt is ancestor to the English monarchs of the houses of Lancaster by his first wife and Tudor by his mistress and later third wife, whose children bore the surname "Beaufort".
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.
Thomas Courtenay, 6th/14th Earl of Devon
Thomas Courtenay, 6th/14th Earl of Devon (1432 – 3 April 1461), was the eldest son of Thomas de Courtenay, 5th/13th Earl of Devon, by his wife Margaret Beaufort, the daughter of John Beaufort, 1st Earl of Somerset, and Margaret Holland, daughter of Thomas Holland, 2nd Earl of Kent.
Through his mother he was a great great-grandson of King Edward III.
The ordinal number given to the early Courtenay Earls of Devon depends on whether the earldom is deemed a new creation by the letters patent granted 22 February 1334/5 or whether it is deemed a restitution of the old dignity of the de Redvers family.
Authorities differ in their opinions, and thus alternative ordinal numbers exist, given here.
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.
John Beaufort, 1st Duke of Somerset
John Beaufort, 1st Duke of Somerset( c. 1403 – 27 May 1444) was an English nobleman and military commander during the Hundred Years' War.
Margaret Holland, Duchess of Clarence
Margaret Holland( 1385 – 30 December 1439) was a medieval English noblewoman.
She was a daughter of Thomas Holland, 2nd Earl of Kent, who was the son of Joan" the Fair Maid of Kent"( granddaughter of Edward I of England, wife of Edward the Black Prince and mother of Richard II of England).
Margaret's mother was Alice FitzAlan, daughter of Richard FitzAlan, 10th Earl of Arundel and Eleanor of Lancaster.
Margaret married John Beaufort, 1st Earl of Somerset, son of John of Gaunt and his mistress Katherine Swynford.
They had six children:
In 1399, she was invested as a Lady Companion, Order of the Garter( L.G.).
After Beaufort died in 1410( in the Tower of London), she married his nephew Thomas of Lancaster, Duke of Clarence( 1387 – 1421), the son of King Henry IV.
They had no children.
She died on 30 December 1439 at St. Saviour's Abbey, Bermondsey, in London, England.
Margaret and both her husbands are buried together in a carved alabaster tomb in Canterbury Cathedral that shows her lying between the two of them.
John Beaufort, 1st Earl of Somerset
John Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, (c. 1371 – 16 March 1410) was an English nobleman and politician.
He was the first of the four illegitimate children of John of Gaunt (1340-1399)
(third surviving son of King Edward III) by his mistress Katherine Swynford, whom he later married in 1396.
Beaufort's surname (properly "de Beaufortfrom Beaufort") probably reflects his birthplace at his father's castle and manor of Beaufort ("beautiful stronghold") (from 1688 "Montmorency-Beaufort") in Champagne, France, situated 100 miles east of Paris, 25 miles north-east of Troyes, and between the River Seine and River Marne.
The Portcullis heraldic badge of the Beauforts, now the emblem of the House of Commons, is believed to have been based on that of the castle of Beaufort, now demolished.
The Beaufort children were declared legitimate twice by parliament during the reign of King Richard II of England, in 1390 and 1397, as well as by Pope Boniface IX in September 1396.
Even though they were the grandchildren of Edward III and next in the line of succession after their father's legitimate children by his first two wives, the Beauforts were barred from succession to the throne by their half-brother Henry IV.
Henry Beaufort, 2nd Earl of Somerset
Henry Beaufort, 2nd Earl of Somerset(" probably" 26 November 1401 – 25 November 1418) was the eldest son of John Beaufort, 1st Earl of Somerset, and the grandson of John of Gaunt, 1st Duke of Lancaster and Katherine Swynford.
Henry succeeded his father as Earl of Somerset on 16 March 1410.
During his minority, his mother, Margaret Beaufort, Countess of Somerset held his lands for him until he reached the age of 15.
When Henry was seventeen, he was placed under the command of Thomas Beaufort, Duke of Exeter, his uncle, at the Siege of Rouen during the Hundred Years'
War where he, as well as a number of other nobles, met his demise, although the exact reasons of his death are unknown.
He never married and was succeeded by his younger brother, John Beaufort, 1st Duke of Somerset.

Question: What is the place of birth of John Beaufort, 1St Earl Of Somerset's father?
Answer: Ghent