Mayor Guillén de Guzmán (1205–1262) was a member of one of the most aristocratic families in the court of King Ferdinand III of Castile.
In 1255, Alfonso gave her lands in La Alcarria which included Cifuentes, Viana de Mondéjar, Palazuelos, Salmerón, Vadesliras and Alcocer.
[2] From her relationship with Infante Alfonso she had one daughter: She died in early 1262 in Alcocer and was buried in the monastery of the Poor Clares that she had founded at San Miguel del Monte.
Years later, on July 24, 1276, King Alfonso executed an agreement with Juan González who made a walnut-wood sepulchre with a bas-relief image of Mayor.
Her body, which remained intact until the beginning of the 20th-century, disappeared in 1936 along with a polychromed sculpture considered among the best funerary art from the Middle Ages in Guadalajara.