Princess Elisabeth Marie of Bavaria
Princess Elisabeth of Bavaria (8 January 1874 – 4 March 1957) was a member of the Bavarian Royal House of Wittelsbach.
She was known as Princess of Bavaria until 1918.
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.
Princess Elizabeth of Greece and Denmark
Princess Elisabeth of Greece and Denmark( 24 May 1904 – 11 January 1955) was the middle daughter of Prince Nicholas of Greece and Grand Duchess Elena Vladimirovna of Russia.
Elisabeth of the Palatinate
Elisabeth of the Palatinate( 26 December 1618 – 11 February 1680), also known as Elisabeth of Bohemia, Princess Elisabeth of the Palatinate, or Princess- Abbess of Herford Abbey, was the eldest daughter of Frederick V, Elector Palatine( who was briefly King of Bohemia), and Elizabeth Stuart.
Elisabeth of the Palatinate is a philosopher best known for her correspondence with René Descartes.
She was critical of Descartes' dualistic metaphysics and her work anticipated the metaphysical concerns of later philosophers.
Princess Elisabeth of Hesse and by Rhine (1895–1903)
Princess Elisabeth of Hesse and by Rhine( Prinzessin Elisabeth Marie Alice Viktoria von Hessen und bei Rhein)( 11 March 1895 – 16 November 1903) was a German Hessian and Rhenish child princess, the only daughter of Ernst Ludwig, Grand Duke of Hesse and by Rhine and his first wife, Princess Victoria Melita of Saxe- Coburg and Gotha.
She was named after her paternal great- grandmother, who was born Princess Elisabeth of Prussia.
Her paternal aunt had the same name and was also nicknamed Ella.
Elisabeth's early death was rumored to be a result of poison meant for her uncle, Tsar Nicholas II, but the court physician said she died of virulent typhoid, probably caused by her taking a drink of water from a contaminated stream.
Princess Elisabeth of Thurn and Taxis (1860–1881)
Princess Elisabeth of Thurn and Taxis( German:" Elisabeth Maria Maximiliana")( 28 May 1860, Dresden, Kingdom of Saxony – 7 February 1881, Ödenburg, Austrian Empire)
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.
Princess Elisabeth of Luxembourg (1901–1950)
Princess Elisabeth of Luxembourg (Elisabeth Marie Wilhelmine; 7 March 1901 – 2 August 1950) was the daughter of William IV, Grand Duke of Luxembourg, and his wife, Infanta Marie Anne of Portugal.
In 1922, she married Prince Ludwig Philipp of Thurn and Taxis.
Princess Elisabeth of Anhalt
Princess Elisabeth of Anhalt (7 September 1857 – 20 July 1933) was the Grand Duchess of Mecklenburg-Strelitz from 1904 to 1914 as the spouse of Adolf Friedrich V, Grand Duke of Mecklenburg-Strelitz.
William IV, Grand Duke of Luxembourg
William IV (William Alexander; "French:
Guillaume Alexandre"; 22 April 1852 – 25 February 1912) reigned as the Grand Duke of Luxembourg from 17 November 1905 until his death.
He succeeded his father, Adolphe.
William was a Protestant, the religion of the House of Nassau.
He married Princess Marie Anne of Portugal, believing that a Roman Catholic country ought to have a Roman Catholic monarch.
Thus his heirs have been Catholic.
At the death of his uncle, Prince Nikolaus-Wilhelm in 1905, the only other legitimate male in the House of Nassau-Weilburg was William's cousin, Georg Nikolaus, Count of Merenberg, the product of a morganatic marriage.
So in 1907, William declared the Counts of Merenberg non-dynastic, naming his own eldest daughter Marie-Adélaïde (1894–1924) as heir presumptive to the grand ducal throne.
She became Luxembourg's first reigning grand duchess upon her father's death in 1912, and upon her own abdication in 1919, was succeeded by her younger sister Charlotte (1896–1985).
Charlotte's descendants reign until the present day.
He was the last monarch of Luxembourg to die whilst still on the throne.

Question: Who is Princess Elisabeth Of Luxembourg (1901–1950)'s paternal grandfather?
Answer: Adolphe