Hispania/Iberia united by Portugal

Yes.

I think the relative power of Leon vs Portugal is being overstated here as IIRC they had similar populations c1230 (hopefully someone can find these figures!) so any union will make them more equal than Leon dominated. Especially if we contrive a trial union of GLP rather than LP.
And if language is taken into account Galician is much closer to Portuguese so Portuguese could get the edge in any union when nationalisation occurs.

By mind I think the Portuguese population in 1300 was 1-1.5M with 1.5 being the most likely but in 1400 it was down to 1M. No idea on the Leonese.
 
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