John IV, Duke of Bavaria
John IV. of Bavaria- Munich( German: Johann IV., Herzog von Bayern),( 4 October 1437, in Munich – 18 November 1463, in Munich) was duke of Bavaria- Munich from 1460 until his death.
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.
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.
William of Bavaria-Munich
William of Bavaria-Munich (1435–1435) was a German nobleman.
He was the son of Margaret of Cleves and her first husband William III, Duke of Bavaria.
He was born after his father’s death and died in infancy, being buried in the church of the Carmelites in Straubing.
His elder brother Adolf nominally ruled as duke alongside his uncle Ernest and his cousin Albert III until he died at age seven.
Ernest, Duke of Bavaria
Ernest of Bavaria- Munich,( Munich, 1373 – 2 July 1438 in Munich), from 1397 Duke of Bavaria- Munich.
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
John II, Duke of Bavaria
Duke John II of Bavaria- Munich( 1341 – 1397),( German:" Johann II, Herzog von Bayern- München"), since 1375 Duke of Bavaria- Munich.
He was the third son of Stephen II and Elizabeth of Sicily.
Albert IV, Duke of Bavaria
Duke Albert IV of Bavaria- Munich( 15 December 1447, Munich – 18 March 1508, Munich), was Duke of Bavaria- Munich from 1467, and Duke of the reunited Bavaria from 1503.
Elisabeth of Bavaria, Electress of Saxony
Elisabeth of Bavaria-Munich (2 February 1443 in Munich – 5 March 1484 in Leipzig) was a princess of Bavaria-Munich by birth and by marriage Electress of Saxony.
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.

Question: Who is William Of Bavaria-Munich's maternal grandmother?
Answer: Marie of Burgundy