Johann Adolf I, Duke of Saxe-Weissenfels
Johann Adolf I, Duke of Saxe- Weissenfels( 2 November 1649, in Halle – 24 May 1697, in Weissenfels), was a duke of Saxe- Weissenfels- Querfurt and member of the House of Wettin.
He was the first son of Augustus, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin.
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.
Princess Maria Elisabeth of Bavaria
Princess Maria Elisabeth of Bavaria( 9 September 1914 – 13 May 2011) was the eldest daughter of Prince Franz of Bavaria, third son of Ludwig III of Bavaria.
Princess Irmingard of Bavaria
Princess Irmingard of Bavaria( 29 May 1923 – 23 October 2010) was the daughter of Rupprecht, Crown Prince of Bavaria and his second wife, Princess Antonia of Luxembourg.
She was a half- sister of Albrecht, Duke of Bavaria.
Philip, Duke of Holstein-Gottorp
Philip, Duke of Holstein- Gottorp( 10 August 1570 – 18 October 1590) was the second son of Adolf, Duke of Holstein- Gottorp( 1526 – 1586) and his wife, Christine of Hesse( 1543 – 1604).
After the early death of his elder brother Frederick II in 1587, he inherited the ducal share of rule in the royal Danish- ducal condominium of the duchies of Holstein and of Schleswig at the age of 17.
He died three years later.
Mechtild of Nassau
Mechtild of Nassau( before 1280 – 19 June 1323) was the youngest child of Adolf of Germany and his wife Imagina of Isenburg- Limburg.
Mechtild is also known as" Matilda of Nassau".
She was Duchess consort of Bavaria, by her marriage to Rudolf I, Duke of Bavaria.
Adolf, Duke of Bavaria
Adolf (7 January 1434, Munich - 24 October 1441, Munich) was a German nobleman.
He was a Duke of Bavaria-Munich in the House of Wittelsbach.
He was the eldest son of William III, Duke of Bavaria and Margaret of Cleves.
His younger brother William of Bavaria-Munich died in infancy.
Since William III's brother Ernest and Ernest's son Albert III were available as ruling dukes, Adolf's role was very limited.
He died aged only seven and thus had little effect on the duchy's fortunes.
Sigismund, Duke of Bavaria
Sigismund of Bavaria (26 July 1439 – 1 February 1501) was a member of the Wittelsbach dynasty.
He ruled as Duke of Bavaria-Munich from 1460 to 1467, and then as Duke of Bavaria-Dachau until his death.
Albert III, Duke of Bavaria
Albert III the Pious of Bavaria- Munich( 27 March 1401 – 29 February 1460), since 1438 Duke of Bavaria- Munich.
He was born in Wolfratshausen to Ernest, Duke of Bavaria and Elisabetta Visconti, daughter of Bernabò Visconti.
Margaret of Cleves, Duchess of Bavaria-Munich
Margaret of Cleves (1416–1444) was a German noblewoman.
She was the eldest daughter of Adolph I, Duke of Cleves and his second wife Marie of Burgundy.
She married

Question: Who is Adolf, Duke Of Bavaria's maternal grandfather?
Answer: Adolph I