WI: Frederick, Count of Luna, King of Aragon

What happens if Martin the Elder, King of Sicily, was able to get Frederick, the Count of Luna and the illegitimate son of Martin the Younger, King of Aragon, legitimized by the Pope and crowned as the King of Aragon in 1410?
 
Off topic, but...

Yes, I know Luna is part of Italy (in Eturia "But hark the cry is Astor, and lo, the ranks divide, and the great lord of Luna comes with his stately stride")

But still... Claiming the Moon, as part of Spanish royal titles would be so cool...:)
 
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