In 1455 she married Henry IV of Castile and six years later had a daughter named also Joan, called "La Beltraneja" because of rumours that she was in fact daughter of Don Beltran de la Cureva. Henry sent Joan to live in Coca at the castle of Henry's supporter, bishop Fonseca. She fell in love with Bishop Fonseca's nephew and was expecting his child. Enrique declared their marriage not and never legal. Joan wore scandalous dresses that were low cut and her behavior was also scandalous. She later went to the convent of San Fransico in Segovia. She died in Madrid on June 13, 1475.