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.
Prince Filiberto, Duke of Genoa
Prince Filiberto of Savoy, 4th Duke of Genoa ("Filiberto Lodovico Massimiliano Emanuele Maria"; 10 March 1895 – 7 September 1990) was the fourth Duke of Genoa and a member of the House of Savoy.
Born in Turin, Prince Filiberto was the second son of Prince Thomas of Savoy-Genoa, Duke of Genoa and his wife Princess Isabella of Bavaria (1863–1924).
On 22 September 1904 he was given the title Duke of Pistoia.
Prince Filiberto pursued a career in the Royal Italian Army achieving the rank of General.
A supporter of Benito Mussolini, he volunteered to serve in the Second Italo-Abyssinian War where he commanded the 1st Blackshirt Division.
It was his division that raised the Italian flag over Amba Aradam.
When Italy joined World War II, he became commander of the Italian 7th Army, but held no major commands after Italy joined the Allies.
Prince Filiberto married Princess Lydia of Arenberg (1 April 1905 in Brussels – 23 July 1977 in Lausanne) on 30 April 1928 in Turin.
She was a daughter of Engelbert-Marie, 9th Duke of Arenberg, and Princess Hedwige of Ligne.
They had no children.
After the Second World War a referendum was held in Italy where a majority of people voted to abolish the monarchy.
With the death of his brother Ferdinando on 24 June 1963 he succeeded to the title Duke of Genoa.
Prince Filiberto died in Lausanne, Switzerland.
His youngest brother Eugenio succeeded to the title Duke of Genoa.
Prince Eugenio, Duke of Genoa
Prince Eugenio of Savoy, 5th Duke of Genoa( Eugenio Alfonso Carlo
Maria Giuseppe; 13 March 1906 – 8 December 1996) was a member of the House of Savoy, Duke of Ancona from birth, and the 5th and final Duke of Genoa.
Prince Eugenio was the sixth and youngest child of Prince Thomas of Savoy, 2nd Duke of Genoa and his wife Princess Isabella of Bavaria.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Princess Isabella of Bavaria
Princess Isabella of Bavaria (
Marie Elisabeth Luise Amalie Elvire Blanche Eleonore; 31 August 1863 – 26 February 1924) was the third child and eldest daughter of Prince Adalbert of Bavaria and his wife Infanta Amalia of Spain.
By her marriage to Prince Thomas, Duke of Genoa, she became referred to as the Duchess of Genoa.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Thomas Howard, 2nd Duke of Norfolk
Thomas Howard, 2nd Duke of Norfolk( 144321 May 1524), styled Earl of Surrey from 1483 to 1485 and again from 1489 to 1514, was an English nobleman and politician.
He was the eldest son of John Howard, 1st Duke of Norfolk, by his first wife, Catharina de Moleyns.
The Duke was the grandfather of both Queen Anne Boleyn and Queen Catherine Howard and the great grandfather of Queen Elizabeth I.
He served four monarchs as a soldier and statesman.
Prince Ferdinando, Duke of Genoa (1884–1963)
Prince Ferdinando of Savoy, 3rd Duke of Genoa(" Ferdinando Umberto Filippo Adalberto"; 21 April 1884 – 24 June 1963) was the third Duke of Genoa and a member of the House of Savoy.
He was an admiral in the Royal Italian Navy.

Question: Who is the maternal grandfather of Prince Filiberto, Duke Of Genoa?
Answer: Prince Adalbert of Bavaria