WI: Ferdinand of Portugal, Duke of Guarda's daughter Luisa survived?

From Wikipedia:

Ferdinand was born in Abrantes on 5 June 1507. At birth, he was made Duke of Guarda by his father. He was also Lord of Alfaiates, Sabugal and Abrantes, and Mayor of Trancoso, Lamego and Marialva.

In 1530 he married Guiomar Coutinho, 5th Countess of Marialva and 3rd Countess of Loulé, a rich heiress from a Portuguese noble family. The marriage was arranged by King John III of Portugal, Ferdinand's older brother. The couple settled in Abrantes, where their two children were born: a daughter, Luisa (born in 1531), and a son, born on 1 August 1533, who died shortly after his birth.

Luisa, his only surviving child, died in October 1534. Ferdinand himself died one month later, on 7 November 1534, in Abrantes. He is buried in the Church of Saint Dominique of Abrantes. His widow, Guiomar Coutinho, died one month later, on 9 December.

So what if those two children, or even just Luisa, had survived. If Luisa alone had survived, she is now one of the most wealthy heiresses in Europe. Most likely considered for her first cousins, the Princes of Portugal: Manuel (b.1531: d.1537), Filipe (b.1533: d.139) and Denis (b.1535: d.1537). By the time Joao Manuel comes around, she's 6 years older tan him.

So who are the available Catholic Princes in the mid 1540s, which is around the time she will most likely marry. A basic list involves:
- Luís of Portugal, Duke of Beja

- Teodósio I, Duke of Braganza

- Philip, Prince of Asturias and Girona

- Ferdinand II, Archduke of Austria

- Charles II de Valois, Duke of Orleans

- Emmanuel Philibert, Duke of Savoy
Out of all of these options, I see Emmanuel or Ferdinand being the most obvious.
 
From Wikipedia:



So what if those two children, or even just Luisa, had survived. If Luisa alone had survived, she is now one of the most wealthy heiresses in Europe. Most likely considered for her first cousins, the Princes of Portugal: Manuel (b.1531: d.1537), Filipe (b.1533: d.139) and Denis (b.1535: d.1537). By the time Joao Manuel comes around, she's 6 years older tan him.

So who are the available Catholic Princes in the mid 1540s, which is around the time she will most likely marry. A basic list involves:
- Luís of Portugal, Duke of Beja

- Teodósio I, Duke of Braganza

- Philip, Prince of Asturias and Girona

- Ferdinand II, Archduke of Austria

- Charles II de Valois, Duke of Orleans

- Emmanuel Philibert, Duke of Savoy
Out of all of these options, I see Emmanuel or Ferdinand being the most obvious.

Actually, I could half see her being offered to a Portuguese noble - like Braganza or Beja (yuck, uncle-niece marriage alert!). She's not a king's daughter, so the chances of a foreign match is slim. She is an heiress though (through her mother), and I could see that either candidate might be interested in acquiring the lands/titles she inherited. But, the other thing is, if she survives, her mom and dad might do the same, given that they expired after her, so there might be another boy born to them, which would mean she's no longer heiress to anything.
 
Actually, I could half see her being offered to a Portuguese noble - like Braganza or Beja (yuck, uncle-niece marriage alert!). She's not a king's daughter, so the chances of a foreign match is slim. She is an heiress though (through her mother), and I could see that either candidate might be interested in acquiring the lands/titles she inherited. But, the other thing is, if she survives, her mom and dad might do the same, given that they expired after her, so there might be another boy born to them, which would mean she's no longer heiress to anything.

I thought it too. In that period, the only daughters of younger sons of a Portuguese king who reached adulthood were Maria and Catherine of Guimarães, daughters of Edward, Duke of Guimarães. The first married Alessandro Farnese, Duke of Parma (who was the son of a bastard daughter of Charles V) and the second married the Duke of Braganza. So, they didn't married into high European royalty, but minor nobles with bastardy in their family lines (after all, her mother would probably be considered a commoner by the standards of German nobility).
If Luisa had lived long enough to marry, I believe a good candidate for her hand would be John of Lencastre, the 1st Duke of Aveiro (although he wasn't really favoured by John III). Emmanuel Filibert is an option, as they were cousins, but I believe Savoy would eventually marry a French bride in order to appease the Valois and try to secure his lands (as he did IOTL).
Also, if there are some butterflies due to her survival, she could be married to any son born from Edward of Guimarães and Isabella of Braganza. IOTL their only son was born in 1541, but they could have had one earlier.
 
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