No "Curse of the Templars"

I recently finished The Accursed Kings from French Author Maurice Druon. It is about French history from the burning at the stake of Jacques de Mollay (last templar Grand Master) and his cursing of the French royal family ("You'll be cursed up to the thirteenth generation of your race!" to quote him) to the beginning of the Hundred Year's Wars.
Although those books are romanced and the author developp some theories that were not proven true, it was very interesting and got me some ideas.

The first one is this : How about having John I the Posthumous surviving infancy instead of dying five days after his birth?

John I was born on 1316 and was the son of Louis X and Clemence of Hungary. If he survives, he will be under regency up until 1331 and his 15th birthday (a King's majority in the middle age). What would be the consequences of this, besides butterflying away the Hundred Years' War?

Who could marry John I if he survived infancy and lived up to adulhoot or more?

And who are going to be his regents? From reading the books, I got the impression that we would get first Philippe de Poitiers (OTL Philippe V of France), John I's uncle, until he dies then Charles de Valois, John I's great uncle. How would the regency influenced John I?
 
I'm doing a little threadmancy on this as I have rethought about this.

If John I survives infancy, he could live for around 50 years as it is around that time that his grandfather Philippe IV and his Valois Cousins lived for around that much. Since he was born in 1316, that would make him die around 1366.

Having John I rule longer will naturally butterfly the reign of his two capetian Uncles, Philippe de Poitiers and Charles de la Marche (OTL King Philippe V and Charles IV of France) as well as the accession of his Valois cousins to the throne. However, since John I was born right after his father's death, he will be under Regency until his fifteenth birthday (which happen in 1331), so both his Uncles and the Valois will play an important part in the Regency. Louis X's wife, Clemence of Hungary, will also play some sort of role.

Since John I is a legitimate son of Louis X, there will be no quarrel for his rights against his half sister Joan of Navarre. She will thus never get any rights to the crown of Navarre, meaning there will be no separation of the Crowns of France and Navarre (as had happened after Charles IV's death). This might leave the French with some lands south of the Pyreenees.

Also, if John I has childrens, this will butterfly Edward III of England's claims to the throne. That means no Hundred Years' War. Of course, as the King of England is still Duke of Aquitaine, there might still be tensions between France and England.

Lastly, that means that John I (or his descendants) could inherit the Duchy of Burgundy. OTL, when Duke Philip I of Burgundy died, there were two claimants to the ducal throne : Charles II of Navarre and John II of France. These two claimants will be butterflied away by John I's survival : we could thus have the Duchy of Burgundy becoming part of the Kingdom of France earlier than OTL.

What I wonder is who John I could marry... Who are his potential brides in the 1330s?
Also, would John I let the Pope return to Rome? The Pope was still in Avignon at the time.

Thoughts?
 
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