Charles IV of France has a surviving son

I've come back to this idea, and I wonder, if Charles IV's second son, Louis, survives, a betrothal between him and Joanna of Penthievre could have been arranged in the four years between Louis' birth and Charles' death in 1328? From what I've read, Charles IV was greedy but conservative - "inclined to forms and stiff-necked in defence of his prerogatives, while disinclined either to manipulate them to his own ends or achieve wider reform". But I'd imagine he'd not pass up the opportunity for the crown to inherit the Duchy of Brittany.

I've also posited that Joanna of Penthievre might be betrothed to John of Valois, but I've also thought that Philip of Valois, being next in line to the throne and by marrying his son and heir to a powerful and/or wealthy heiress, might be accused of predicting/hoping for the King's death. Please stop me if I'm wrong.
I think what you’ve said is right, I do think Charles would want his son married to Joanna and that Philip would be wary of doing anything that might construed treason
 
New scenario:

* Charles IV's son by Marie of Luxembourg, Louis, survives his birth in 1324. When Charles IV dies in 1328, he becomes King Louis XI of France and Louis II of Navarre.
* Philip of Valois, the appointed regent, betrothes his daughter, Marie, to the young king, as part of his efforts to keep his ear.
* Charles, Duke of Calabria, still dies in 1328. IOTL, his widow, Marie of Valois, sister of the French regent, gave birth o a daughter, Marie. ITTL, she gives birth to a son, named Robert.
* Charles of Calabria's eldest surviving daughter, Maria (IOTL lived from 1326-1328) survives. King Robert of Naples, as part of his efforts to placate the elder Hungarian branch of the Angevins, arranges a double-betrothal between his grandson and eldest granddaughter, to a daughter and second son (Louis) of King Charles of Hungary, the eldest Hungarian prince, Ladislaus, being already betrothed to Anne of Bohemia.
* Philip of Valois' daughter, Marie, dies unexpectedly in 1333. Philip, determinted to keep his hold on the king, looks for one of his nieces to betroth Louis to. He, with some input from Louis, chooses Joanna, the younger and more beautiful of the surviving Neapolitan princesses.
* In 1343, King Robert I 'the Wise' of Naples dies, and the throne goes to his 14-year-old grandson, King Robert II.
* When the Black Death hits Naples in 1347-1348, King Robert II falls ill and dies. His sister, Maria, becomes Queen for a few months until she too succumbs to the plague, leaving Joanna as Queen. Louis of Hungary is driven out by the discontent and fearful Neopolitans who invite Queen Joanna to return. Louis XI of France wants to claim Naples and Provence by right of his wife, but Louis, and his older brother, Ladislaus, see Naples as their God-given right...

Thoughts?
The Kingdom of Navarre is already in the hands of Jeanne de Navarre, the wife of the Count of Evreux.
 
The Kingdom of Navarre is already in the hands of Jeanne de Navarre, the wife of the Count of Evreux.

No, she succeeded in Navarre only after the deaths of both her uncles. It was part of the "succession package" Philip VI presented. If Charles IV had sons, no doubt his line would continue to hold Navarre.
 
No, she succeeded in Navarre only after the deaths of both her uncles. It was part of the "succession package" Philip VI presented. If Charles IV had sons, no doubt his line would continue to hold Navarre.
Exactly. Jeanne received Navarre only after the male line of her paternal grandmother was extinct and she was the senior female heiress
 
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