[3] As part of the dower, King Alfonso gave her Guadalajara, Talavera de la Reina and Olmedo.

In the peace treaty of Seville in July 1340,[4] Alfonso agreed to have Leonor sent to a convent, thereby securing the support of the King of Portugal in the Battle of Río Salado which was fought on 30 October 1340, although, once the military conflict had been resolved, he returned to his mistress and did not fulfill the promise he had made to the Portuguese monarch.

At Alfonso's death, on 26 March 1350, Maria secured a power position by exerting influence upon the leader of her son's council, João Afonso de Albuquerque.

[7] She died in Évora on 18 January 1357 and was buried there until, against the wishes expressed in her will, her remains were transferred to the Royal Monastery of San Clemente in Seville.

In 1371, King Henry II had ordered that his father, King Alfonso XI, should receive burial at the Royal Collegiate Church of Saint Hippolytus in Córdoba and at the same time, he probably decided that Maria, who had been responsible for his mother's death, should be buried at the Royal Monastery of San Clemente in Seville.