WI: Alice of Savoy survives?

Before the future King John of England was married to Isabella of Gloucester by his father, he had been betrothed to Alice, daughter of Humbert III, Count of Savoy. IOTL she died crossing the Alps, but what if she had lived to marry John?
 
Well it would change his lineage.
Perhaps the ATL equivalent of Henry III affects the Earl Marshall's loyalty and Prince Louis succeeds as King of England.
Perhaps an ATL equivalent of Richard of Cornwall successfully becomes German Roman Emperor
 
Before the future King John of England was married to Isabella of Gloucester by his father, he had been betrothed to Alice, daughter of Humbert III, Count of Savoy. IOTL she died crossing the Alps, but what if she had lived to marry John?

Well, according to the marriage treaty, John was to succeed Umberto III as Count of Savoy. So, should that have happened, the Angevin Empire would stretch from Ireland, England, through Aquitaine, Brittany, and other parts of southern France, even as far as Italy. I'd start getting worried if I were the French king
 
Well, according to the marriage treaty, John was to succeed Umberto III as Count of Savoy. So, should that have happened, the Angevin Empire would stretch from Ireland, England, through Aquitaine, Brittany, and other parts of southern France, even as far as Italy. I'd start getting worried if I were the French king
I suspect Philippe would act much as he did OTL and deprive John of his lands. Savoy would end up with Humbert's son as OTL
 
Well, according to the marriage treaty, John was to succeed Umberto III as Count of Savoy. So, should that have happened, the Angevin Empire would stretch from Ireland, England, through Aquitaine, Brittany, and other parts of southern France, even as far as Italy. I'd start getting worried if I were the French king
Would this treaty remain valid in the future? The same year Alice died her father gained a son by his new wife that IOTL succeeded him. If this son isn't butterflied (I can't find the time lapse between Alice's death and her brother's birth) he would have a strong claim to the inheritance. Also, Humbert had other daughter, and whoever marries her might want a piece of Savoyard territory.
 
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