Elizabeth of Rhuddlan
Elizabeth of Rhuddlan was the eighth and youngest daughter of King Edward I and Queen Eleanor of Castile. Of all of her siblings, she was closest to her younger brother King Edward II, as they were only two years apart in age.
After some time travelling England, it was decided Elizabeth should follow her husband. Her father accompanied her, travelling through the Southern Netherlands between Antwerp, Mechelen, Leuven and Brussels, before ending up in Ghent. There they remained for a few months, spending Christmas with her two sisters Eleanor and Margaret. OnNovember 1299, John died of dysentery, though there were rumours of his murder. No children had been born from the marriage.
Source: Wikipedia