William IV, Duke of Bavaria
William IV (13 November 1493 – 7 March 1550) was Duke of Bavaria from 1508 to 1550, until 1545 together with his younger brother Louis X, Duke of Bavaria.
He was born in Munich to Albert IV and Kunigunde of Austria, a daughter of Emperor Frederick III.
Mechthild of Sayn
Countess Mechthild of Sayn( c. 1203 – c. 1291), also called Mechthild of Landsberg, Mechtild, Mechtildis or Mathilde, was the wife of Henry III of Sayn.
She was an important figure in the Late Middle Ages because of her religious foundations(" Stiftungen").
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Mechthild of Bavaria
Mechthild of Bavaria (12 July 1532 – 2 November 1565 in Baden-Baden) was a German noblewoman.
She was the daughter of William IV, Duke of Bavaria and his wife Marie.
She was buried in the Stiftskirche at Baden-Baden.
On 17 January 1557 she married Philibert, Margrave of Baden-Baden, and they had the following children:
Mechthild is a German form of Matilde.
Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Question: Who is the paternal grandmother of Mechthild Of Bavaria?
Answer: Kunigunde of Austria