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Beatrice was born c. 1380, possibly in Veiros, Alentejo, Portugal. Some say that her mother Inês Pires was "the daughter of a Jewish cobbler." But others say she came from an old Portuguese noble line. In April 1405 her wedding with Thomas Fitzalan, 12th Earl of Arundel by proxy was celebrated in Lisbon and, in the same year, she travelled to England, accompanied by her brother Afonso and many of the king's vassals and her ladies-in-waiting where the marriage ceremony took place on 26 November 1405 in London, with King Henry IV in attendance.
Thomas died on 13 October 1415. Beatrice then married John Holland, 2nd Earl of Huntingdon, nephew of her stepmother Queen Philippa, in 1432. She is sometimes confused with another Portuguese lady, Beatrice Pinto, wife of Gilbert Talbot and Thomas Fittiplace. It is unknown if Beatrice had children from any of her marriages. Beatrice died in Bordeaux, France in November 1439. After her death her husband married Lady Anne Montagu.
Elbl, Martin Malcolm (2023). "The Pregnant Abbess: Sex, Social 'Norms', and Nuns in the Lower Douro Valley Southern Hill Country, 1410s – 1440s". Portuguese Studies Review 31 (2): 7–69.. The last part of the article discusses "the other Portuguese lady", Beatriz Pinto (and her two spouses -- Gilbert Talbot and Thomas Fettiplace ), at length, in context and with extensive secondary and primary sources (English and Portuguese). The article includes a digital facial reconstruction from burial effigy. The pages specifically pertaining to Beatriz Pinto and the confusion involving her and the Countess of Arundel are 58-69.
Rodrigues Oliveira, Ana (2010). Rainhas medievais de Portugal. Dezassete mulheres, duas dinastias, quatro séculos de História (in Portuguese). Lisbon: A esfera dos livros. ISBN978-989-626-261-7.