What if Charles the Bold had more than one daughter by Isabella of Bourbon? In particular what if Mary of Burgundy had an older sister and so was not her father‘s heiress presumptive?
 
Trees
Another WIP (as always)
POD is Mary of Burgundy having an elder sister

Charles I, King of Lorraine and Duke of Burgundy (1433-1491) married a) Catherine of France (1428-1446) in 1440, b) Isabella of Bourbon (1437-1465) in 1454, c) Margaret of York (b. 1446) in 1468
  1. b) Isabella of Burgundy (1455-1482) married Nicholas of Anjou, Duke of Lorraine (1448-1478) in 1470
    1. Charles II, King of Lorraine, Duke of Burgundy and Lorraine (b. 1471) married a) Cecily of York (1469-1486) in 1485, b) Philippa of Guelders (b. 1467) in 1487
    2. Isabella of Lorraine (b. 1472) married Edward V, King of England (b. 1470) in 1486
    3. John, Duke of Anjou, Maine and Brittany (b. 1474) married Anne, Duchess of Brittany (b. 1477) in 1490
    4. Margaret of Lorraine (1476-1479)
    5. Philip, Count of Provence (b. 1477) married ?
    6. Mary of Lorraine (1479)
  2. b) Mary of Burgundy (b. 1457) married Maximilian I, Holy Roman Emperor and King of Hungary (b. 1459) in 1475 with issues
    1. Frederick of Austria (1476)
    2. Eleanor of Austria (b. 1478) married ?
    3. Charles V, Holy Roman Emperor and King of Hungary (b. 1480) married ?
    4. Helena (b. 1483) married Casimir V, King of Poland (b. 1485) *
    5. Margaret (1483)
    6. Maximilian (1485-1486)
    7. Mary (b. 1487) married Vladislaus III, King of Bohemia (b. 1483) **
*Casimir is the only child of St. Casimir of Poland (1458-1485) and Kunigunde of Austria (b. 1465) who here married in 1483.
*Vladislaus is son of Vladislaus II, King of Bohemia and his wife Barbara of Brandenburg (as here Barbara was able to keep her first husband‘s lands and so Vladislaus consummated the marriage)

Edward IV, King of England (1442–1486) married Elizabeth Woodville (1437-1492) in 1464
  1. Elizabeth of York (b. 1466) married Charles VIII, King of France (b. 1470) in 1484
  2. Mary of York (1467-1482)
  3. Cecily of York (1469-1486) married Charles II, King of Lorraine (b. 1471)
  4. Edward V, King of England (b. 1470) married Isabella of Lorraine (b. 1472)
  5. Margaret of York (1472-1472)
  6. Richard, Duke of York and Norfolk (b. 1473) married Anne Mowbray, Countess of Norfolk (b. 1472)
  7. Anne of York (b. 1475) married James IV, King of Scotland (b. 1473)
  8. George, Duke of Bedford (1477-1479)
  9. Catherine of York (b. 1479) married Christian II, King of Denmark, Sweden and Norway (b. 1481)
  10. Bridget of York (b. 1480) nun

Notes: if someone is wondering it, here Charles the Bold died in war (against France, for securing John‘s inheritance and wedding)
 
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