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John I of Castile was King from 1379 to 1390.
On May 14, 1383, he married Beatrice of Portugal, the daughter of King Ferdinand I of Portugal.
Ferdinand I of Portugal died in 1383.
King John of Castile invaded Portugal in the end of December 1383. This was to enforce his claim to be king by right of his wife. The consequent war ended in 1385.

Suppose Beatrice had been recognized as Queen Regnant of Portugal. What happens then?
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