Katherine of Aragon born a boy?

Basically what it says on the tin. Instead of a Catalina, the baby comes out a boy - or, perhaps, given that Maria of Aragon was a twin, Isabella gives birth to two living twins this time. Regardless, the little infante is likely named Ferdinand or Alfonso, and is heir once Juan dies.

So how does this alter the fates of Spain and England, not to mention people like Charles, still likely to be Holy Roman Emperor and yet nephew to the King of Spain instead of inheriting there too. Who would Alfonso (I prefer that name for less confusion) marry, and our Tudor princes for that matter? Does a little less sorrow and worry extend Isabella's life? Would a teenaged King Alfonso of Castile clash with Dad after Isabella's death?
 
Ferdinand II of Aragon (b.1452: d.1516) m. Isabella I of Castile (b.1451: d.1504) (a), Germaine de Foix (b.1488: d.1538) (b)

1a) Isabella of Aragon (b.1470: d.1498) m. Afonso, Prince of Portugal (b.1475: d.1491) (a), Manuel I of Portugal (b.1469: d.1521) (b)

1b) Miguel de Paz (b.1498: d.1500)​

2a) Miscarriage (c.1475)

3a) Juan, Prince of Asturias (b.1478: d.1497) m. Margaret of Austria (b.1480: d.1530) (a)

1a) Stillborn Daughter (c.1497)​

4a) Juana of Aragon (b.1479: d.1555) m. Philip I, Holy Roman Emperor (b.1479: d.1530) (a)

1a) Eleanor of Austria (b.1498)

2a) Charles of Austria (b.1500)

3a) Isabella of Austria (b.1501)

4a) Ferdinand of Austria (b.1503)

5a) Mary of Austria (b.1505)

6a) Catherine of Austria (b.1507)

7a) Maximilian of Austria (b.1508)

8a) Margaret of Austria (b.1510)

9a) Joanna of Austria (b.1513)​

5a) Maria of Aragon (b.1482: d.1517) m. Manuel I of Portugal (b.1469: d.1521) (a)

1a) Juan, Prince of Portugal (b.1502)

2a) Isabella of Portugal (b.1503)

3a) Beatrice of Portugal (b.1504)

4a) Luis, Duke of Beja (b.1506)

5a) Ferdinand, Duke of Guarda (b.1507)

6a) Cardinal Afonso of Portugal, Archbishop of Lisbon (b.1509: d.1540)

7a) Cardinal Henry of Portugal, Archbishop of Braga and Evora (b.1512: d.1580)

8a) Maria of Portugal (b.1513: d.1513)

9a) Edward, Duke of Guimaraes (b.1515)

10a) Anthony of Portugal (b.1516: d.1516)​

6a) Stillborn Girl (c.1482)

7a) Alfonso XII of Castile, VI of Aragon (b.1485: d.1536) m. Sidonie of Bavaria (b.1488: d.1513) (a), Mary Tudor (b.1496: d.1533) (b)

1a) Maria of Castile (b.1507)

2a) Isabella of Castile (b.1509: d.1510)

3a) Catherine of Castile (b.1511)

4b) Alfonso, Prince of Asturias (b.1517: d.1530)

5b) Charles I of Spain (b.1520)

6b) Juana of Castile (b.1521: d.1524)

7b) Blanche of Castile (b.1522)

8b) Stillborn Boy (c.1525)​

8b) Juan of Aragon (b.1509: d.1509)​
 
Somehow I'm wondering about the relationship between the now surviving Trastamaras and the Holy Roman Empire.

As to a bride for Alfonso, Bona Sforza's mom attempted to betroth her to whichever of Fernando's grandsons would inherit the Spanish realms, so maybe that match could happen if Margarethe of Austria is for some unknown reason unavailable. That said, it would be interesting to see how Spain's first half century unfolds with a king on the ground in Valladolid/Barcelona as opposed to being on the road much of the time.
 
So it would very likely be Margaret of Austria for Alfonso - which could become tense once reports start reaching Spain of Philip's ill treatment of Juana.

It'd be interesting if, let's say, Alfonso is a twin or Isabella manages one more pregnancy, thus producing a Catalina to marry Arthur Tudor and then Henry. Her status might improve without the turmoil that engulfed Spain when Juana was heiress of Castile, so things could go better for her. If she and Henry marry sooner, they might have better luck with kids. And say the Mary Tudor the elder/Charles of Austria match goes through. Tudors, Trastamaras, and Hapsburgs linked but separate; the Valois are likely to be very nervous and trying to find weak links.
 
Basically what it says on the tin. Instead of a Catalina, the baby comes out a boy - or, perhaps, given that Maria of Aragon was a twin, Isabella gives birth to two living twins this time. Regardless, the little infante is likely named Ferdinand or Alfonso, and is heir once Juan dies.

So how does this alter the fates of Spain and England, not to mention people like Charles, still likely to be Holy Roman Emperor and yet nephew to the King of Spain instead of inheriting there too.

The Hapsburgs do not inherit Spain, nor Naples, Sicily, and Sardinia (then possessions of Aragon). Spain does not inherit the Netherlands, Alsace, or Franche-Comté.

Incidentally, this will butterfly the accidental death of Afonso of Portugal (first husband of Katherine's eldest sister), her subsequent marriage to Afonso's uncle Manuel, and her only child Miguel de la Paz (subject of several TLs).

Arthur marries someone else, obviously. His early death may be butterflied (he was healthy, and it had no known cause). I thought his birth might be butterflied, but he was conceived only a few days after Katherine's birth, so not. However, Henry is butterflied, and so is Edmund (third son, died in infancy), and their sisters Margaret and Mary (and Elizabeth and Katherine).

Trap the butterflies, and assume more or less OTL's issue for Henry.

Who would Alfonso (I prefer that name for less confusion) marry, and our Tudor princes for that matter?

Again, most of the OTL potential spouses for the Princes would be younger and very likely buttterflied; also, butterflies would cause some of the older candidates to die and others who died to live.

However, the Tudor princesses both married older men. So if a princess is available, alt-Margaret's marriage to James IV of Scotland still happens. Alt-Mary's marriage to Louis XII of France probably does not - it was arranged by Cardinal Wolsey as part of an alliance with France against the looming superpower of Spain+Austria+extras, which ITTL is not a concern. Also, of course, butterflies may give Louis XII a living son (he had two living daughters, but four stillborn sons). In which case he will not be desperate to marry and beget an heir.

Does a little less sorrow and worry extend Isabella's life? Would a teenaged King Alfonso of Castile clash with Dad after Isabella's death?

Who knows?
 
Based on some of the chatter :)
Ferdinand II of Aragon (b.1452: d.1516) m. Isabella I of Castile (b.1451: d.1504) (a), Germaine de Foix (b.1488: d.1538) (b)

1a) Isabella of Aragon (b.1470: d.1498) m. Afonso, Prince of Portugal (b.1475: d.1491) (a), Manuel I of Portugal (b.1469: d.1521) (b)

1b) Miguel de Paz (b.1498: d.1500)​

2a) Miscarriage (c.1475)

3a) Juan, Prince of Asturias (b.1478: d.1497) m. Margaret of Austria (b.1480: d.1530) (a)

1a) Stillborn Daughter (c.1497)​

4a) Juana of Aragon (b.1479: d.1555) m. Philip I, Holy Roman Emperor (b.1479: d.1530) (a)

1a) Eleanor of Austria (b.1498)

2a) Charles of Austria (b.1500)

3a) Isabella of Austria (b.1501)

4a) Ferdinand of Austria (b.1503)

5a) Mary of Austria (b.1505)

6a) Catherine of Austria (b.1507)

7a) Maximilian of Austria (b.1508)

8a) Margaret of Austria (b.1510)

9a) Joanna of Austria (b.1513)​

5a) Maria of Aragon (b.1482: d.1517) m. Manuel I of Portugal (b.1469: d.1521) (a)

1a) Juan, Prince of Portugal (b.1502)

2a) Isabella of Portugal (b.1503)

3a) Beatrice of Portugal (b.1504)

4a) Luis, Duke of Beja (b.1506)

5a) Ferdinand, Duke of Guarda (b.1507)

6a) Cardinal Afonso of Portugal, Archbishop of Lisbon (b.1509: d.1540)

7a) Cardinal Henry of Portugal, Archbishop of Braga and Evora (b.1512: d.1580)

8a) Maria of Portugal (b.1513: d.1513)

9a) Edward, Duke of Guimaraes (b.1515)

10a) Anthony of Portugal (b.1516: d.1516)​

6a) Stillborn Girl (c.1482)

7a) Alfonso XII of Castile, VI of Aragon (b.1485: d.1536) m. Margaret of Austria (b.1480: d.1513) (a), Bona Sforza (b.1494: d.1557) (b)

1a) Maria of Castile (b.1507)

2a) Isabella of Castile (b.1509: d.1510)

3a) Catherine of Castile (b.1511)

4b) Alfonso, Prince of Asturias (b.1517: d.1530)

5b) Charles I of Spain (b.1520)

6b) Juana of Castile (b.1521: d.1524)

7b) Blanche of Castile (b.1522)

8b) Stillborn Boy (c.1525)​

8a) Catherine of Aragon (b.1488: d.1530) m. Arthur, Prince of Wales (b.1485: d.1501) (a), Henry VIII of England (b.1491: d.1547) (b)

1a) Mary Tudor (b.1510)

2a) Stillborn Boy (c.1511)

3a) Stillborn Boy (c.1512)

4a) Henry Tudor, Prince of Wales (b.1515)

5a) Elizabeth Tudor (b.1517: d.1520)

6a) Stillborn Boy (c.1518)​

9b) Juan of Aragon (b.1509: d.1509)​
 
Based on some of the chatter :)
Ferdinand II of Aragon (b.1452: d.1516) m. Isabella I of Castile (b.1451: d.1504) (a), Germaine de Foix (b.1488: d.1538) (b)
1a) Isabella of Aragon (b.1470: d.1498) m. Afonso, Prince of Portugal (b.1475: d.1491) (a), Manuel I of Portugal (b.1469: d.1521) (b)
1b) Miguel de Paz (b.1498: d.1500)​
2a) Miscarriage (c.1475)

3a) Juan, Prince of Asturias (b.1478: d.1497) m. Margaret of Austria (b.1480: d.1530) (a)
1a) Stillborn Daughter (c.1497)​
4a) Juana of Aragon (b.1479: d.1555) m. Philip I, Holy Roman Emperor (b.1479: d.1530) (a)
1a) Eleanor of Austria (b.1498)

2a) Charles of Austria (b.1500)

3a) Isabella of Austria (b.1501)

4a) Ferdinand of Austria (b.1503)

5a) Mary of Austria (b.1505)

6a) Catherine of Austria (b.1507)

7a) Maximilian of Austria (b.1508)

8a) Margaret of Austria (b.1510)

9a) Joanna of Austria (b.1513)​
5a) Maria of Aragon (b.1482: d.1517) m. Manuel I of Portugal (b.1469: d.1521) (a)
1a) Juan, Prince of Portugal (b.1502)

2a) Isabella of Portugal (b.1503)

3a) Beatrice of Portugal (b.1504)

4a) Luis, Duke of Beja (b.1506)

5a) Ferdinand, Duke of Guarda (b.1507)

6a) Cardinal Afonso of Portugal, Archbishop of Lisbon (b.1509: d.1540)

7a) Cardinal Henry of Portugal, Archbishop of Braga and Evora (b.1512: d.1580)

8a) Maria of Portugal (b.1513: d.1513)

9a) Edward, Duke of Guimaraes (b.1515)

10a) Anthony of Portugal (b.1516: d.1516)​
6a) Stillborn Girl (c.1482)

7a) Alfonso XII of Castile, VI of Aragon (b.1485: d.1536) m. Margaret of Austria (b.1480: d.1513) (a), Bona Sforza (b.1494: d.1557) (b)
1a) Maria of Castile (b.1507)

2a) Isabella of Castile (b.1509: d.1510)

3a) Catherine of Castile (b.1511)

4b) Alfonso, Prince of Asturias (b.1517: d.1530)

5b) Charles I of Spain (b.1520)

6b) Juana of Castile (b.1521: d.1524)

7b) Blanche of Castile (b.1522)

8b) Stillborn Boy (c.1525)​
8a) Catherine of Aragon (b.1488: d.1530) m. Arthur, Prince of Wales (b.1485: d.1501) (a), Henry VIII of England (b.1491: d.1547) (b)
1a) Mary Tudor (b.1510)

2a) Stillborn Boy (c.1511)

3a) Stillborn Boy (c.1512)

4a) Henry Tudor, Prince of Wales (b.1515)

5a) Elizabeth Tudor (b.1517: d.1520)

6a) Stillborn Boy (c.1518)​
9b) Juan of Aragon (b.1509: d.1509)​

I have three issues with your genealogy here:
a) no way Margaret will marry Alfonso after Juan's death. Philip and Juana's wedding will be more than enough to keep the alliance strong
b) no way Ferdinand will remarry if he has still a male heir with Isabella (OTL he remarried only for trying to keep at least Aragon away from Philip of Burgundy who he hated; so if he has any other heir o heiress he will not have any reason to remarry).
c) Isabella was her parents' eldest and favourite child and she was totally against the idea to remarry after the death of her first beloved husband. Sure the treaty with Portugal had a clause who said she was to marry the next heir in case of Alfonso's death and Manuel wanted marry her but Ferdinand and Isabella forced her to marry Manuel mostly because they needed a more senior heir than Juana for keep Philip away from their lands. If they had another son is likely who Manuel in the end will marry directly Maria
https://www.alternatehistory.com//it.pinterest.com/pin/create/extension/
 
I have three issues with your genealogy here:
a) no way Margaret will marry Alfonso after Juan's death. Philip and Juana's wedding will be more than enough to keep the alliance strong
b) no way Ferdinand will remarry if he has still a male heir with Isabella (OTL he remarried only for trying to keep at least Aragon away from Philip of Burgundy who he hated; so if he has any other heir o heiress he will not have any reason to remarry).
c) Isabella was her parents' eldest and favourite child and she was totally against the idea to remarry after the death of her first beloved husband. Sure the treaty with Portugal had a clause who said she was to marry the next heir in case of Alfonso's death and Manuel wanted marry her but Ferdinand and Isabella forced her to marry Manuel mostly because they needed a more senior heir than Juana for keep Philip away from their lands. If they had another son is likely who Manuel in the end will marry directly Maria

What about a match between Germaine de Foix or Ana d'Albret and Alfonso?
 
Even more based on some of the chatter :)


Ferdinand II of Aragon (b.1452: d.1516) m. Isabella I of Castile (b.1451: d.1504) (a),

1a) Isabella of Aragon (b.1470: d.1559) m. Afonso, Prince of Portugal (b.1475: d.1491) (a)

2a) Miscarriage (c.1475)

3a) Juan, Prince of Asturias (b.1478: d.1497) m. Margaret of Austria (b.1480: d.1530) (a)

1a) Stillborn Daughter (c.1497)​

4a) Juana of Aragon (b.1479: d.1555) m. Philip II, Holy Roman Emperor (b.1479: d.1530) (a)

1a) Eleanor of Austria (b.1498)

2a) Charles of Austria (b.1500)

3a) Isabella of Austria (b.1501)

4a) Ferdinand of Austria (b.1503)

5a) Mary of Austria (b.1505)

6a) Catherine of Austria (b.1507)

7a) Maximilian of Austria (b.1508)

8a) Margaret of Austria (b.1510)

9a) Joanna of Austria (b.1513)​

5a) Maria of Aragon (b.1482: d.1517) m. Manuel I of Portugal (b.1469: d.1521) (a)

1a) Manuel, Prince of Portugal (b.1498)

2a) Eleanor of Portugal (b.1500)

3a) Stillborn Boy (c.1501)

4a) Juan of Portugal (b.1502)

5a) Isabella of Portugal (b.1503)

6a) Beatrice of Portugal (b.1504)

7a) Luis, Duke of Beja (b.1506)

8a) Ferdinand, Duke of Guarda (b.1507)

9a) Cardinal Afonso of Portugal, Archbishop of Lisbon (b.1509: d.1540)

10a) Cardinal Henry of Portugal, Archbishop of Braga and Evora (b.1512: d.1580)

11a) Maria of Portugal (b.1513: d.1513)

12a) Edward, Duke of Guimaraes (b.1515)

13a) Anthony of Portugal (b.1516: d.1516)​

6a) Stillborn Girl (c.1482)

7a) Alfonso XII of Castile, VI of Aragon (b.1485: d.1536) m. Germaine de Foix (b.1488: d.1514) (a), Bona Sforza (b.1494: d.1557) (b)

1a) Maria of Castile (b.1507)

2a) Isabella of Castile (b.1509: d.1510)

3a) Catherine of Castile (b.1511)

4b) Alfonso, Prince of Asturias (b.1517: d.1530)

5b) Charles I of Spain (b.1520)

6b) Juana of Castile (b.1521: d.1524)

7b) Blanche of Castile (b.1522)

8b) Stillborn Boy (c.1525)​

8a) Catherine of Aragon (b.1488: d.1530) m. Arthur, Prince of Wales (b.1485: d.1501) (a), Henry VIII of England (b.1491: d.1547) (b)

1a) Mary Tudor (b.1510)

2a) Stillborn Boy (c.1511)

3a) Stillborn Boy (c.1512)

4a) Henry Tudor, Prince of Wales (b.1515)

5a) Elizabeth Tudor (b.1517: d.1520)

6a) Stillborn Boy (c.1518)​
 
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Would Fernand and Isabella really allow their oldest daughter to just go into a convent (even with the succession more secure by them having two boys)? Wouldn't they try to make some diplomatic match with her?
 
Would Fernand and Isabella really allow their oldest daughter to just go into a convent (even with the succession more secure by them having two boys)? Wouldn't they try to make some diplomatic match with her?

Well, at her second marriage she was aged 28 and desperately didn't want to get remarried. It took almost a decade to get her to the alter. I can see, in this ITL timeline, Isabella being free to stay unmarried.
 
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