Eleanor of Castile was Queen of England as the first wife of Edward I. She was educated at the Castilian court and also ruled as Countess of Ponthieu in her own right from 1279. After diplomatic efforts to secure her marriage and affirm English sovereignty over Gascony, 13-year-old Eleanor was married to Edward at the monastery of Las Huelgas, Burgos, on 1 November 1254. She is believed to have birthed a child not long after.

The Abbey of Santa María la Real de Las Huelgas is a monastery of Cistercian nuns located approximately 1.5 km west of the city of Burgos in Spain. The word huelgas, which usually refers to "labour strikes" in modern Spanish, refers in this case to land which had been left fallow. Historically, the monastery has been the site of many weddings of royal families, both foreign and Spanish, including that of Edward I of England to Eleanor of Castile in 1254, for example. The defensive tower of the abbey is also the birthplace of King Peter of Castile.