sentences:  Yet, her parents lived in Castile from 1340 and it was between that year and 1356 when the children of the marriage were born, as well as the illegitimate daughter; there are no sources that mention the births or the early years of the siblings.This is the reason Portuguese historian Ferro Tavares suspects the place of her birth was actually in Castilian territory and that the birthplace was changed on purpose.According to this hypothesis, the place of origin was moved to a Portuguese location in order to stress the political detachment he made from the Franco-Castilian diplomatic bloc in the Hundred Years' War with such a marriage.