Question on marriages:
If Katherine is marrying the Aragonese infante here, and I'm assuming that Philippa of Lancaster's Portuguese marriage precludes one of Katherine's brothers wedding Brites of Portugal (as Richard II proposed for their double first cousin, Edward of Norwich), that leaves the following people with no chair:
Maria of Sicily (possibly marries Visconti if a Barcelonid is unavailable)
Katherine's full brothers (I imagine Peter will wed in England, but Edward might wed abroad
Enrique III of Castile.
On another note, there WAS a plan at a point (ICR EXACT dates ATM to wed Elizabeth of Lancaster to Charles VI of France). Could Katherine be requested by the French instead?