WI: The House of Barcelona Survives

What about enabling an Urgell succession, and Philip of Urgell surviving as a result?

Extremely difficult. If Jaume d'Urgell is a pretender to the crown, Martin I is going to try to promote his grandson, Federick, the bastard child of Martin the Younger, and Urgell will be undone by this and we'll get the Trastamaras.
 
Admittedly, his death seems to be the easiest to butterfly, since he seems to have died on campaign/in battle.

How's this for a POD then: Martin the Younger pulls through whatever it was that killed him OTL, and succeeds his father as King in Aragon and Sicily on the old man's death in 1410. In 1413, on the death of his father-in-law, his wife, succeeds as Queen Blanca of Navarre. Their marriage has thus far been fruitful:

Miscarried son (1403)
Martin, Principe Ereditario de Sicilia (1406-1407)
Carlos, Principe Ereditario de Sicilia, Duke de Girona, Count of Cervera (b. 1409)
Martin, infante of Aragon and Sicily (b.1411)
Isabel (1413-1415)
Leonor (b.1414)
Isabel (b.1415)
Felipe, infante of Aragon and Sicily (b.1418)
Maria (b.1422)

Crown Prince Carlos, heir to the thrones of Navarre, Aragon and Sicily, is betrothed at first to the French princess, Marie d'Anjou (eldest daughter of Yolande of Aragon, duchesse d'Anjou, daughter of King Martin I's older brother, King Joan I), but as tensions mount between the Aragonese and the Angevin over the childlessness of Queen Giovanna II of Naples (an Anjou), Martin and Blanca start to seek a bride elsewhere.

It could be, why not.
 
Extremely difficult. If Jaume d'Urgell is a pretender to the crown, Martin I is going to try to promote his grandson, Federick, the bastard child of Martin the Younger, and Urgell will be undone by this and we'll get the Trastamaras.
So have Martin I die earlier.
 
The Angevins did little when Martin the Younger became king of Sicily and after him his father. About Giovanna... there could be a war, indeed, as IOTL.

Which Castillian infantes? I got lost with so many butterflies.
 
Which Castillian infantes? I got lost with so many butterflies.

The ones born before the POD, namely Fernando 'el Antequera' and his kiddies - OTL Alfonso V and Juan II of Aragon, Enrique of Villena and Maria of Aragon, Queen of Castile. Would they be willing to just sit back and let Enrique III (and his wife/widow) run the show in peace or would they be hungering for a crown elsewhere?
 
Well, you can bet that Juan and Enrique would cause as many troubles as they did IOTL. Alfonso would be a wandering spirit, always restless, never satisfied with anything or anyone.

Just look at the actions of Fernando pre-1410.
 
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