Alvaro de Luna (2) and a wife whose name we don't know, had a son, Jaime.

It's possible that this Alvaro de Luna was Condestable de Castilla and grand master of the Order of Santiago, who virtually ruled Castile until he fell from royal favor and was executed in 1454 - but we can't say for sure. El Condestable, however, DOES appear elsewhere in this genealogy.
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Child of Alvaro de Luna (2) and ??? ???:

i Jaime de Luna y Aragon