King Alfonso's most long-lasting extra-marital relationship, which began in 1218 and lasted until his death in 1230, was with Teresa Gil de Soverosa. A member of the Portuguese nobility, Teresa was the daughter of Gil Vasques de Soverosa and his first wife María Aires de Fornelos. They had four children, all of them born between 1218 and 1230: Sancha (d. 1270). Married Simon Ruiz, Lord of Los Cameros. She later became a nun at the convent of Santa Eufemia de Cozuelos which she had founded. María (died after July 1275).On 4 July 1275, María donated a fourth part of Lougares to the Monastery of Santa María de Melón (document published by the Real Academia Gallega ). Her first marriage was with Álvaro Fernández de Lara. She was then the concubine of her nephew King Alfonso X of Castile and, according to the Count of Barcelos, her second husband was Suero Arias de Valladares. Martín (died 1268/1272), married to Maria Mendes de Sousa, founders of the Monastery of Sancti-Spíritus, Salamanca. There was no issue from this marriage. Urraca (d. after 1252). First married García Romeu, and then Pedro Núñez de Guzmán.
King Alfonso's most long-lasting extra-marital relationship which began in 1218 and lasted until his death in 1230, was with Teresa Gil de Soverosa. A member of the Portuguese nobility, Teresa was the daughter of Gil Vasques de Soverosa and his first wife María Aires de Fornelos. They had four children, all of them born between 1218 and 1230: Sancha (d. 1270). Married Simon Ruiz, Lord of Los Cameros. She later became a nun at the convent of Santa Eufemia de Cozuelos which she had founded. María (died after July 1275).On 4 July 1275, María donated a fourth part of Lougares to the Monastery of Santa María de Melón (document published by the Real Academia Gallega ). Her first marriage was with Álvaro Fernández de Lara. She was then the concubine of her nephew King Alfonso X of Castile and, according to the Count of Barcelos, her second husband was Suero Arias de Valladares. Martín (died 1268/1272), married to Maria Mendes de Sousa, founders of the Monastery of Sancti-Spíritus, Salamanca. There was no issue from this marriage. Urraca (d. after 1252). First married García Romeu, and then Pedro Núñez de Guzmán.