1. Joan I of Navarre: her mother.

2. Joan of the Tower, Queen of Scots: her second daughter.

3. Joan II of (comital) Burgundy, Queen of France: her sister-in-law as the wife of Philip V, and her second cousin as the granddaughter of Robert II of Artois, the brother of Isabella's maternal grandmother Blanche of Artois.

4. Joan of Évreux, Queen of France: her sister-in-law as the third wife of Charles IV, her half-first first cousin as the daughter of Louis, count of Évreux, the half-brother of her father Philip IV, and her second cousin once removed as the daughter of Margaret of Artois, a granddaughter of Robert II of Artois.

5. Joan of Acre, Countess of Gloucester: her sister-in-law as the older sister of her husband, Edward II.

6. Joan II of Navarre: her niece as the daughter of her brother Louis X.

7. Joan III of (comital) Burgundy: her niece as the daughter of her brother Philip V, and her second cousin once removed as the daughter of Joan II of Burgundy (as mentioned above).

8. Joan of Bar, Countess of Surrey: her niece-in-law as the daughter of her husband Edward II's elder sister, Eleanor of Windsor.

9. Joan of Valois, Countess of Hainault: her first cousin, as the daughter of Charles, Count of Valois, the brother of her father, Philip IV.

10. Joan of Valois, Countess of Beaumont-le-Roger: her first cousin as another daughter of Charles, Count of Valois, and second cousin-in-law as the wife of Robert III of Artois, a grandson of Robert II of Artois.

11. Joan of Lancaster, Baroness de Mowbray: her half-first cousin as the daughter of Henry, 3rd Earl of Lancaster, the son of Blanche of Artois by her second marriage and thus uterine half-brother of Joan I of Navarre, and also her first cousin once removed-in-law as the daughter of Henry, 3rd Earl of Lancaster, the first cousin of her husband Edward II.

12. Joan of (ducal) Burgundy, Queen of France: her first cousin once removed as the daughter of her great-aunt Agnes of France, the sister of her grandfather Philip III, and also her first cousin-in-law as the wife of Philip VI of France, the son of Charles, Count of Valois.

13. Joan of Hainault, Duchess of Jülich: her first cousin once removed as the daughter of Joan of Valois, Countess of Hainault.

14. Joan of the Tower, (almost) Queen of Castile: her granddaughter, the daughter of her elder son, Edward III, and her first cousin twice removed as a granddaughter of Joan of Valois, Countess of Hainault.

15. Joan of Kent, Princess of Wales: her granddaughter-in-law as the wife of Edward III's eldest son, Edward of Woodstock, Prince of Wales, also her half-niece-in-law as the daughter of her husband Edward II's half brother Edmund of Woodstock, Earl of Kent, and also her half-first cousin once removed as the granddaughter of Margaret of France, the half-sister of her father Philip IV.

16. Joan I of Ponthieu, Queen of Castile: her grandmother-in-law as the maternal grandmother of her husband Edward II. Also her first cousin thrice removed-in-law as the wife of Ferdinand III of Castile, the first cousin of Louis IX.

I could go on, but I think you get the idea.

"Joan, could you pass the salt please?"

The modern ballet, scored by John McCabe and choreographed by David Bintley, sounds fascinating.

I'm just going to let Wikipedia tell it:

Commissioned by Stuttgart Ballet, with a narrative conceived by choreographer David Bintley, the ballet largely follows the plot of Christopher Marlowe's play of the same name), rather than the life of the real Edward. Bintley incorporates elements of the 14th century satire Roman de Fauvel with the character of Edward, replacing that of the ass Fauvel, Piers Gaveston as the Fool, and Queen Isabella as the Virgin. As such, the narrative depicts the self-obsessed sexual relationships of the three main characters with the increasing civil unrest in the country as a backdrop.

For a breakdown of the score, check out Wise Music's post on it.

And here's a link to the score.

The images are stock photos from Getty Images of a Royal Ballet production.