What if Charles V married Mary Tudor (the elder) in 1515 and as consequence the Habsburg would be divided in three branches instead of the OTL two?
 
Trees
Karl V, Holy Roman Emperor (b. 1500) married a) Mary Tudor (1496-1515) in 1514, b) Anne of Hungary (b. 1503) in 1516
  1. a) Philip I, Holy Roman Emperor (b. 1515) married Sybille, Duchess of Jülich-Cleves-Berg (b. 1512)
  2. b) Eleanor (b. 1521)
  3. b) Maximilian, King of Hungary and Bohemia (b. 1522)
  4. b) Elisabeth (b. 1523)
  5. b) Anna (b. 1525)
  6. b) Margaret (b. 1526)
  7. b) Frederick (1527)
  8. b) Joanna (1529-1532)
  9. b) Magdalena (b. 1530)
  10. b) Agnes (b. 1531)
  11. b) Charles (b. 1533)
  12. b) Helena (b. 1536)

Isabella of Austria (b. 1501) married a) Christian II, King of Denmark (1481-1520) in 1514 b) Antoine, Duke of Loraine (b. 1489)
  1. a) John II, King of Denmark, Sweden and Norway (b. 1518)
  2. a) Philip Ferdinand (1519), twin of Maximilian
  3. a) Maximilian (1519), twin of Philip Ferdinand
  4. a) Dorothea of Denmark (b. 1520)
  5. b) Anne of Lorraine (b. 1522)
  6. b) Charles III, Duke of Lorraine (b. 1524)
  7. b) Isabella of Lorraine (b. 1528)
  8. b) Eleanor of Lorraine (b. 1530)

Eleanor of Austria (b. 1498) married Francis I, King of France (b. 1494) in 1517
  1. Charles IX, King of France (b. 1518)
  2. Isabella (b. 1520)
  3. Francis, Duke d’Orleans (1522-1530)
  4. Madeleine (b. 1525)
  5. Margaret (1526)
  6. Eleanor (b. 1528) married Francis III, Duke of Brittany (b. 1531)

Mary/Margaret ? (b. 1505) married a) Louis of Hungary and Bohemia (1506-1515) in 1515, b) Sigismund I, King of Poland (b. 1467) in 1519
  1. b) Sigismund II of Poland (b. 1522)
  2. b) Eleanor (b. 1524)
  3. b) Isabella (b. 1526)
  4. b) Albert (1528)
  5. b) miscarriage (1529)
  6. b) stillborn son (1531)
  7. b) Margaret (1532)

Claude, Duchess of Brittany (1499-1516) married Francis I, King of France (b. 1494)
  1. Louise, Duchess of Brittany (1515-1517)
  2. Charlotte, Duchess of Brittany (b. 1516-1527)
James IV, King of Scotland (b. 1512) married Renée, Duchess of Brittany (b. 1510) in 1526
  1. Anne (b. 1528) married Alexander Stewart, Duke of Albany and Count of Auvergne and Boulogne (b. 1519) *
  2. James VI, King of Scotland (b. 1530) married
  3. Francis III, Duke of Brittany (b. 1531) married Eleanor of France (b. 1528)
  4. Margaret (1532-1535)

*son of John of Albany and his cousin and second wife Madeleine de la Tour d‘Auvergne (who he married after Anne’s death in 1515)
 
What about Ferdinand?
I have no tree for him or Catalina as they are not involved in my planning of this thread, still Catalina will marry as OTL, likely with the OTL luck while Ferdinand will become King of Castile and Aragon marrying Isabella of Portugal, with at least a surviving son
 
I have no tree for him or Catalina as they are not involved in my planning of this thread, still Catalina will marry as OTL, likely with the OTL luck while Ferdinand will become King of Castile and Aragon marrying Isabella of Portugal, with at least a surviving son
Oh, I see.
 
Shame Mary died so soon, but at least she gave the Habsburg Austrian branch much needed frsh blood in Philip I.
 
Shame Mary died so soon, but at least she gave the Habsburg Austrian branch much needed frsh blood in Philip I.
Austrian Habsburgs have no need of fresh blood at this point as no Habsburg has married close relatives until that moment (and they had only Joanna’s blood, who was not too damaged, with inbreeding problems).
 
Trees - Spain and Portugal
Ferdinand VI, King of Spain (b. 1503) married Isabella of Portugal (b. 1503) in 1519
  1. John III, King of Spain (b. 1520) married Eleanor, Queen of Portugal (b. 1525)
  2. Isabella (b. 1522)
  3. Maria (1524)
  4. Ferdinand (1525-1528)
  5. Germaine (1527-1528)
  6. Joanna (1530)
  7. Beatrice (b. 1532)

Catherine of Spain (b. 1507) married John III, King of Portugal (b. 1502) in 1523
  1. Maria (1524)
  2. Eleanor, Queen of Portugal (b. 1525) married John III, King of Spain (b. 1520) in 1540
  3. Isabella (b. 1527)
  4. Manuel, Prince of Portugal (1529)
  5. Louis, Prince of Portugal (1530-1533)
  6. Manuela (1532-1533)
  7. John, Prince of Portugal (1534-1546)
  8. Beatrice (b. 1536)
  9. Duarte (1539-1541)
 
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