Such unions have never been illegal in the Iberian peninsula (where uncle and niece marriages are also permitted). If I understand correctly, Infanta Isabel of Castile and Aragon (eldest daughter of Queen Isabel I and King Fernando II) also married twice. I forget her husbands' names, but both were members of the Portugese royal house, and her second husband actually succeeded to the throne as king.
So this example counts, since the king of Portugal was the second husband of a woman. Later on, after his wife's death in childbirth, he remarried with one of her sisters, Infanta Maria.
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