Beatrice of Luxembourg
Beatrice of Luxembourg( 1305 – 11 November 1319), was by birth member of the House of Luxembourg and by marriage Queen of Hungary.
She was the youngest child of Henry VII, Holy Roman Emperor and his wife, Margaret of Brabant.
Her two siblings were John of Luxembourg and Marie of Luxembourg, Queen of France.
Frederick of Luxembourg
Frederick of Luxembourg (965 – 6 October 1019), Count of Moselgau, was a son of Siegfried of Luxembourg and Hedwig of Nordgau.
By a wife whose name is unknown (certain historians give her as Ermentrude, Countess of Gleiberg), he had:
Frederick of Denmark (bishop)
Frederick of Denmark( 13 April 1532–7 October 1556) was the youngest son of Frederick I of Denmark and Sophie of Pomerania.
He was the Prince- Bishop of Hildesheim and Bishop of Schleswig.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Sigfried, Count of the Ardennes
Sigfried (or Siegfried) (– 28 October 998) was count of the Ardennes and the first person to rule Luxembourg.
He was an advocate of the abbeys of St. Maximin in Trier and Saint Willibrord in Echternach.
He may have been the son of Count Palatine Wigeric of Lotharingia and Cunigunda.
He was the founder of the House of Luxembourg, a branch of the House of Ardennes.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Imiza of Luxembourg
Imiza of Luxembourg( also Irmentrude and Ermentrude)( died after), was a German noblewoman.
She was the daughter of Frederick of Luxembourg, and the wife of Welf II of Swabia.
Duke Eugen of Württemberg (1758–1822)
Duke Eugen of Württemberg( 21 November 1758 – 20 June 1822) was a German prince.
He was the brother of Frederick I of Württemberg
Marie of Luxembourg, Queen of France
Marie of Luxembourg( 1304 – 26 March 1324), was by birth member of the House of Luxembourg and by marriage Queen of France and Navarre.
She was the daughter of Henry VII, Holy Roman Emperor and Margaret of Brabant.
Her two siblings were John of Luxembourg and Beatrice of Luxembourg, Queen of Hungary.

Question: Who is Frederick Of Luxembourg's paternal grandfather?
Answer: Wigeric of Lotharingia