Blanche of Castile (1319–1375)

[3] King James II responded to Garci Lasso in a letter dated 7 August 1319 that he approved the late Infante's wish and also recommended him to continue to be a loyal servant for his daughter, the Infanta Maria.

[1] Several historians believed that the real purpose of Juan Manuel to keep his sister-in-law and niece under his control was to secure the support of his father-in-law King James II in his fight for the regency, and in the same time, manage Blanche's inheritance.

[1] In 1322, her mother and Garci Lasso de la Vega, who was the administrator of her estates in Castilian territory, agreed that Blanche should marry her cousin King Alfonso XI when she came of age; however, the plans fell through and the marriage didn't take place.

[7] According to the Chronicle of Pedro I of Portugal by Fernão Lopes, during her stay, she began to show signs of illness and "defects of judgement" which made her unsuitable for marriage and for procreation.

[9] Once in the Kingdom of Castile, Blanche was named Lady of Santa María la Real de Las Huelgas, the last one to hold the civil dominion over the monastery.