John I, Duke of Bourbon
Jean de Bourbon (1381–1434) was Duke of Bourbon, from 1410 to his death and Duke of Auvergne since 1416.
He was the eldest son of Louis II and Anne of Auvergne.
Through his mother, John inherited the County of Forez.
During the Armagnac–Burgundian Civil War he took sides against the Burgundians.
John was captured at the Battle of Agincourt and died a prisoner in London, in spite of the payment of several ransoms, and promises to support the king of England as king of France.
In 1400 in Paris, he married Marie, Duchess of Auvergne, daughter of John, Duke of Berry, who inherited the Auvergne title from her father.
They had three sons:
In addition, he had an illegitimate daughter:
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Abd al-Muttalib
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Charles I, Duke of Bourbon
Charles de Bourbon (1401 – 4 December 1456, Château de Moulins) was the oldest son of John I, Duke of Bourbon and Marie, Duchess of Auvergne.
He was Count of Clermont-en-Beauvaisis from 1424, and Duke of Bourbon and Auvergne from 1434 to his death, although due to the imprisonment of his father after the Battle of Agincourt, he acquired control of the duchy more than eighteen years before his father's death.
In 1425, Charles renewed his earlier betrothal by marrying Agnes of Burgundy (1407–1476), daughter of John the Fearless.
Charles entered a relationship with Jeanne de Bournan, together they had Louis de Bourbon, Count of Roussillon.
Louis founded the House of Bourbon-Roussillon (Rossello).
Louis is known for his many services to the State.
As a reward for his loyalty and dedication to Louis XI during the League of the Public Weal conflict, Louis XI gave him in marriage his legitimized daughter Jeanne de Valois.
Charles served with distinction in the Royal army during the Hundred Years' War, while nevertheless maintaining a truce with his brother-in-law and otherwise enemy, Philip III, Duke of Burgundy.
Both dukes were reconciled and signed an alliance by 1440.
He was present at the coronation of Charles VII where he fulfilled the function of a peer and conferred knighthood.
Despite this service, he took part in the "Praguerie" (a revolt by the French nobles against Charles VII) in 1439–1440.
When the revolt collapsed, he was forced to beg for mercy from the King, and was stripped of some of his lands.
He died on his estates in 1456.
Fujiwara no Nagara
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He was the grandfather of Emperor Yōzei.
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He was the Grandfather of industrialist Paul Wittouck.
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Prithvipati Shah
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He was the grandfather of Nara Bhupal Shah.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
James M. Garnett
James Mercer Garnett( June 8, 1770 – April 23, 1843) was a nineteenth- century politician and planter from Virginia.
He was the brother of Robert S. Garnett, the first cousin of Charles F. Mercer, and the grandfather of Muscoe Russell Hunter Garnett.

Question: Who is Charles I, Duke Of Bourbon's paternal grandfather?
Answer: Louis II