- Daughter of Doña Mayor and her second husband, Juan Fernández de Andeiro, later 2nd Count of Ourém. [Fernando, ch. 134]
- Married Dom Pedro da Guerra, the son of Prince João, the son of King Pedro of Portugal and Inês de Castro. Fernão Lopes remarks that they married for love and very much against the Prince's wishes..[Fernando, ch. 134]
Chronicle entries in which Teresa [de Andeiro] appears:
Crónica de D. Fernando, ch. 134