Question: Who is the mother-in-law of Frederick Ii, Count Of Vaudémont?

Knowledge 1: Yolande, Duchess of Lorraine
Yolande (2 November 1428, Nancy – 23 March 1483, Nancy), was Duchess of Lorraine (1473) and Bar (1480).She was the daughter of Isabella, Duchess of Lorraine, and René of Anjou (King of Naples, Duke of Anjou, Bar and Lorraine, Count of Provence).Though she was nominally in control of major territories, she ceded her power and titles to her husband and her son.In addition, her younger sister was Margaret of Anjou, Queen of England.In the 19th century, a romanticised version of her early life was popularised by the play "King René’s Daughter" by Henrik Hertz, in which she is portrayed as a beautiful blind princess living in an isolated garden paradise.It was later adapted to Tchaikovsky's opera "Iolanta".There is no evidence that she was ever blind. [SEP] Knowledge 2: Frederick II, Count of Vaudémont
Frederick (Ferry) II of Lorraine-Vaudémont (– 31 August 1470), was Count of Vaudémont and Lord of Joinville from 1458 to 1470.He was son of Antoine of Lorraine, Count of Vaudémont and Lord of Joinville and Marie of Harcourt, Countess of Harcourt and Aumale, as well as Baroness of Elbeuf.He is sometimes numbered Frederick V by continuity with the Dukes of Lorraine.In 1445, he married his cousin Yolande of Anjou (1428–1483), daughter of René I of Anjou, (King of Naples, Duke of Anjou, of Bar and of Lorraine, Count of Provence), and of Isabelle, Duchess of Lorraine.This marriage put an end to the litigation which existed between the fathers of the bride and groom, in connection with the succession of the Duchy of Lorraine.They had six children:In 1453 his father-in-law honoured him with the command of the troops that he sent to the Dauphin Louis to help him to fight the Duke of Savoy.In 1456 René entrusted the government of the Duchy of Bar to Frederick, and in 1459 granted him the honorary title of Lieutenant-General of Sicily.
Knowledge 1: Frederick II, Count of Vaudémont
Frederick (Ferry) II of Lorraine-Vaudémont (– 31 August 1470), was Count of Vaudémont and Lord of Joinville from 1458 to 1470.He was son of Antoine of Lorraine, Count of Vaudémont and Lord of Joinville and Marie of Harcourt, Countess of Harcourt and Aumale, as well as Baroness of Elbeuf.He is sometimes numbered Frederick V by continuity with the Dukes of Lorraine.In 1445, he married his cousin Yolande of Anjou (1428–1483), daughter of René I of Anjou, (King of Naples, Duke of Anjou, of Bar and of Lorraine, Count of Provence), and of Isabelle, Duchess of Lorraine.This marriage put an end to the litigation which existed between the fathers of the bride and groom, in connection with the succession of the Duchy of Lorraine.They had six children:In 1453 his father-in-law honoured him with the command of the troops that he sent to the Dauphin Louis to help him to fight the Duke of Savoy.In 1456 René entrusted the government of the Duchy of Bar to Frederick, and in 1459 granted him the honorary title of Lieutenant-General of Sicily. [SEP] Knowledge 2: Frederick I, Count of Vaudémont
Frederick of Lorraine (1371 – October 25, 1415 in the battle of Agincourt) was a Count of Vaudémont.He was the son of Duke John I of Lorraine and younger brother of Charles II.In 1393, Frederick married Margaret the heiress of Vaudémont and Joinville, and became Count of these lands in her right.He founded the House of Vaudémont, a junior branch of the House of Lorraine.His children were:
Dynastic problems in the senior line caused his great-grandson René of Vaudémont to become Duke of Lorraine as René II in 1473.
Knowledge 1: Yolande, Duchess of Lorraine
Yolande (2 November 1428, Nancy – 23 March 1483, Nancy), was Duchess of Lorraine (1473) and Bar (1480).She was the daughter of Isabella, Duchess of Lorraine, and René of Anjou (King of Naples, Duke of Anjou, Bar and Lorraine, Count of Provence).Though she was nominally in control of major territories, she ceded her power and titles to her husband and her son.In addition, her younger sister was Margaret of Anjou, Queen of England.In the 19th century, a romanticised version of her early life was popularised by the play "King René’s Daughter" by Henrik Hertz, in which she is portrayed as a beautiful blind princess living in an isolated garden paradise.It was later adapted to Tchaikovsky's opera "Iolanta".There is no evidence that she was ever blind. [SEP] Knowledge 2: Frederick I, Count of Vaudémont
Frederick of Lorraine (1371 – October 25, 1415 in the battle of Agincourt) was a Count of Vaudémont.He was the son of Duke John I of Lorraine and younger brother of Charles II.In 1393, Frederick married Margaret the heiress of Vaudémont and Joinville, and became Count of these lands in her right.He founded the House of Vaudémont, a junior branch of the House of Lorraine.His children were:
Dynastic problems in the senior line caused his great-grandson René of Vaudémont to become Duke of Lorraine as René II in 1473.

Answer: Isabella, Duchess of Lorraine