So, the major POD here is twofold:
1) Henry VII of England, while living in exile in Brittany as earl of Richmond, marries Marie of Brittany, the widowed cousin of the Breton duke, Francis II. They have a son, Arthur, in 1481.
2) Henry and Maximilian I, Holy Roman Emperor still sign a treaty of friendship in 1493. But the alliance is sealed by the 1497 marriage of Arthur, Prince of Wales and Maximilian’s daughter Margaret of Austria, the scorned fiancee of Charles VIII of France.
HOUSE OF TUDOR
Henry VII Tudor, King of England (formerly earl of Richmond; b. 1457, r. 1485-1509, d. 1509) m. (a) in 1480 to Mary of Brittany (b. 1444, d. 1481) [1], had issue; m. (b) in 1486 to Elizabeth of York (b. 1465, d. 1505), had issue
1a) Arthur II Tudor, King of England (b. 1481, r. 1509-1540, d. 1542) m. in 1497 to Margaret of Austria (b. 1482, d. 1545), had issue
1) Mary Tudor (b. 1499, d. 1505)
2) Henry Tudor (b. 1501, d. 1504)
3) Anne Tudor (b. 1503)
4) Eleanor Tudor, Queen of Denmark (b. 1506) m. in 1525 to King Francis of Denmark (b. 1503) [2], had issue
5) Margaret Tudor, Duchess of Mantua (b. 1509) m. in 1528 to Federico Gonzaga, Duke of Mantua
1b) Edward Tudor, Duke of York (b. 1486, d. 1490)
2b) Margaret Tudor, Queen of Scots (b. 1489, d. 1529) marriage and issue as OTL
3b) Henry Tudor, Duke of York (b. 1491, d. 1547) m. (a) in 1508 to Anne de la Tour d’Auvergne (b. 1494, d. 1518), had issue; m. (b) in 1520 to Lady Mary Boleyn (b. 1499/1500, d. 1543), had issue
1a) Margaret Tudor (b. 1510)
2a) Elizabeth Tudor, Countess of Oxford (b. 1515, d. 1539) m. in 1536 to John de Vere, 16th earl of Oxford, had issue
1) Katherine de Vere (b. 1539, d. 1545)
3a) Edward Tudor, Duke of York (b. 1518)
1b) Mary Tudor, Baroness Dacre (b. 1521, d. 1576) m. in 1537 to Thomas Fiennes, 9th Baron Dacre (b. 1515, d. 1541), had issue
1) Thomas Fiennes (b. 1538, d. 1553)
2) Gregory Fiennes, 10th Baron Dacre (b. 1539, d. 1594)
3) Margaret Fiennes, 11th Baroness Dacre (b. 1540, d. 1611)
2b) Henry Tudor (b. 1522)
3b) Charles Tudor (b. 1525) [3]
Illegitimate by Elizabeth “Bessie” Blount
1) Henry FitzHenry (b. 1519, d. 1536) died unmarried and without issue
4b) Elizabeth Tudor (b. 1493, d. 1495)
5b) Mary Tudor, Queen of France and Duchess of Suffolk (b. 1496, d. 1533) marriages and issue as OTL
6b) Edmund Tudor, Duke of Somerset (b. 1499, d. 1500)
7b) Katherine Tudor (b. 1503, d. 1503)
[1] I can’t find sources on when Mary of Brittany’s OTL husband died so I’m just saying that he died in 1478/1479 and butterflying her four youngest OTL children.
[2] Son of King Christian II of Denmark and Catherine of Aragon. (I’ll get to this later lol)
[3] Named in honor of his godfather, father's friend, and uncle-by-marriage, Charles Brandon, Duke of Suffolk.
Also, would anyone be interested in a thread on this???