Prince Henri of Orléans
Prince Henri of Orléans( 16 October 1867 – 9 August 1901) was the son of Prince Robert, Duke of Chartres, and Princess Françoise of Orléans.
William of Conches
William of Conches( c. 1090 – after 1154) was a French scholastic philosopher who sought to expand the bounds of Christian humanism by studying secular works of the classics and fostering empirical science.
He was a prominent member of the School of Chartres.
John of Salisbury, a bishop of Chartres and former student of William's, refers to William as the most talented grammarian after Bernard of Chartres.
Prince Robert, Duke of Chartres
Prince Robert Philippe Louis Eugène Ferdinand of Orléans, Duke of Chartres (November 9, 1840 – December 5, 1910) was the son of Prince Ferdinand Philippe, Duke of Orléans, and thus grandson of King Louis-Philippe of France.
He fought for the Union in the American Civil War, and then for France in the 1870 Franco-Prussian War.
In 1863 he married his cousin Princess Françoise of Orléans, the daughter of François, Prince of Joinville.
In 1886, he was exiled from France.
Ferdinand Philippe, Duke of Orléans
Prince Ferdinand Philippe of Orléans (3 September 1810 – 13 July 1842) was the eldest son of Louis Philippe d'Orléans, Duke of Orléans (the future King Louis Philippe I) and Maria Amalia of Naples and Sicily.
Born in exile in his mother's native Sicily, he was heir to the House of Orléans from birth.
Following his father's succession as King of the French in 1830, he became the "Prince Royal" and subsequently Duke of Orléans (French: "Duc d'Orléans"), the title by which he is best known.
He died in 1842, never to succeed his father or see the collapse of the July Monarchy and subsequent exile of his family to England.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Prince Charles Louis, Duke of Chartres
Prince Charles Louis of Orléans, Duke of Chartres( Charles Louis Henri Foulques Benoît Elzéar Jean Marie; born 28 July 1972) is the elder son of Prince Jacques, Duke of Orléans and Gersende de Sabran- Pontevès.
William Montagu Douglas Scott, 6th Duke of Buccleuch
William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch and 8th Duke of Queensberry( 9 September 1831 – 5 November 1914) was a Scottish Member of Parliament and peer.
He was the paternal grandfather of Princess Alice, Duchess of Gloucester, and the maternal great- grandfather of Prince William of Gloucester and Prince Richard, Duke of Gloucester.
He was a paternal great- great- grandfather to Sarah, Duchess of York.
Richard Wesley, 1st Baron Mornington
Richard Colley Wesley, 1st Baron Mornington (– 31 January 1758) was an Irish peer, best remembered as the grandfather of Arthur Wellesley, 1st Duke of Wellington.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Prince Jean, Duke of Guise
Prince Jean of Orléans, Duke of Guise( Jean Pierre Clément Marie; 4 September 1874 – 25 August 1940), was the third son and youngest child of Prince Robert, Duke of Chartres( 1840 – 1910), grandson of Prince Ferdinand Philippe and great- grandson of Louis Philippe I, King of the French.
His mother was Françoise of Orléans, daughter of François, Prince of Joinville, and Princess Francisca of Brazil.

Question: Who is Prince Robert, Duke Of Chartres's paternal grandfather?
Answer: Louis Philippe I