WI: Edward I of England permanently loses Gascony?

In 1294, Edward I was essentially hoodwinked into giving up his remaining hereditary lands in France in exchange for a marriage to Philip IV's half-sister, either Blanche or Margaret, under the agreement that it would be restored later. But the French had no intention of giving Gascony back to Edward. In 1303, after Edward made several failed attempts to retake it, the Treaty of France restored Gascony to Edward and confirmed the betrothal of his son to Princess Isabella of France.

What if Philip IV had managed to hold onto Gascony? Any thoughts?
 
In 1294, Edward I was essentially hoodwinked into giving up his remaining hereditary lands in France in exchange for a marriage to Philip IV's half-sister, either Blanche or Margaret, under the agreement that it would be restored later. But the French had no intention of giving Gascony back to Edward. In 1303, after Edward made several failed attempts to retake it, the Treaty of France restored Gascony to Edward and confirmed the betrothal of his son to Princess Isabella of France.

What if Philip IV had managed to hold onto Gascony? Any thoughts?
What about having the children of Margaret inherit Gascony instead..
 
What if Philip IV had managed to hold onto Gascony? Any thoughts?

I think you may have misinterpreted the events there : Gascony fall under commise, since Edward I refused to acknowledge Philipp IV's suzerainty by refusing to consider the Capetians as the highest judicial authority over a conflict between Anglo-Gascons and Franco-Bretons sailors in the region. (Basically, Gascony was confiscated).
It was a general device of Capetian authority against powerful vassals, especially Plantagenêts and was used consistently between the XIIth and XVth centuries on the generak base that "he's not a vassal, he's a very naughty lord". That said, it was more generally a pressuring device, rather than outright annexing one, made to lead the powerful vassal to a bit more conciliating policy or else.
You had indeed, earlier, an agreement for that the french suzerainty was to be reinforced with Edward given up his ducal title and its holdings, only to see them being given back to him, such agreement being sealed (as usual) trough a matrimonial union.
This highly symbolic event never really took place, and commise was maintained.

The confiscation of Gascony in order to make him more compliant didn't prevented Edward to fight with Philippe over this question, but it failed due to inner dissenssions (the usual "you're not fighting for YOUR holdings with OUR money." speech from english nobles), and it soon got mixed up with the results of the war in Flanders which was partially another battleground between Edward and Philippe.
The Treaty of Paris which reestablished Plantagenet authority (sort of) in Gascony, followed the defeat of Golden Spurs, on this regard, but it was merely the result of succedding pontifically buffed truces since Montreuil in 1297.

So, saying that Philippe had no intention whatsoever to give back to Edward Gascony (especially after that Philippe evacuated a significant part of French-occupied Gascony, notably Saintonge and Agenais) seems to me to be at best a litterary exageration. Most of the difficulties, indeed, came from the status of the king of Scotland, ally of Philippe as part of the treaty or not.

That said, I could see a TL where, with more undecisive campaign in Scotland instead of Edward steam-rolling Scotland until 1297, and where Capetian do better in Flanders, you might have different results.
Basically, a Treaty of Paris equivalent where Edward is forced to acknowledge Scotland as part of the deal, where Plantagenet expeditions are even more pitiful than IOTL, and with a convenient pontifical crisis preventing an earlier settlement. It's pretty much far-fetched and multi-PoDal, but you might see a confiscation of several parts of Gascony (probably Saintongais and Agenais, that were only recently gaven back).

But swallowing up all of Gascony in the early XIVth? I don't really think it's doable, a fortiori planned.
 
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