María Afonso de Portugal, Infanta de Portugal

unknown uncertain presumed illegitimate homonymous half-sister of
María de Portugal, reina consorte de Castilla y León ?

• María Alfonso de Portugal, que según algunos genealogistas españoles como Francisco Fernández de Béthencourt​ y Luis de Salazar y Castro​ era hija ilegítima del rey Alfonso IV de Portugal y de una dama de nombre desconocido,​ aunque no aportan ninguna prueba que demuestre esa filiación. ​
• Pero la mayoría de los historiadores portugueses modernos afirman rotundamente que Alfonso IV de Portugal no tuvo ningún hijo ilegítimo, y argumentan que ello pudo ser debido a las malas relaciones que tuvo con sus propios hermanastros,​ o debido a las buenas y armoniosas relaciones que siempre mantuvo con su esposa, la reina Beatriz de Castilla.​ Sin embargo, las importantes donaciones que le han sido hechas prueban la pertenencia a la Casa Real de Portugal, por via ilegítima, lo que parece confirmado por la falta de elementos a su respecho, podendo tratarse de una hija tardía de Dinis I .

1. https://es.wikipedia.org/wiki/Juan_de_Valencia#Or%C3%ADgenes_famili...
2. https://es.wikipedia.org/wiki/Hernando_de_Valencia#Or%C3%ADgenes_fa...

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Translation:

https://es.wikipedia.org/wiki/Fernando_Alfonso_de_Valencia#Matrimon...

Most modern Portuguese historians categorically state that Alfonso IV of Portugal had no illegitimate sons,109 and argue that this could be due to the bad relations he had with his own half-brothers,110 or due to the good and harmonious relations he always maintained with his wife, Queen Beatrix of Castile.111 112 o But according to most Spanish genealogists, such as Francisco Fernández de Bethencourt113 and Luis Bartolomé de Salazar y Castro,114 115 Fernando Alfonso de Valencia married María Alfonso de Portugal,2 who would have been the illegitimate daughter of King Alfonso IV of Portugal4 and a lady of unknown name,116 although they did not provide any proof to prove that filiation.p And according to some of the historians mentioned above, María Alfonso de Portugal was lady of Miranda do Douro, Mirandela, Vila Flor, Torre de Moncorvo and Bemposta and her father gave her 400,000maravedís as a dowry for her late from Dinis I.

And as a result of his marriage to Fernando Alfonso de Valencia, the following children would have been born:

1. Hernando de Valencia (d. 1425). He was the eldest son of Fernando Alfonso de Valencia118 and became alderman of Zamora.114 12 But he renounced his property and professed as a religious of the Order of San Jerónimo4 in the monastery of Guadalupe,107 being also the most outstanding of the founders of the monastery of Our Lady of Montamarta.119
2. Juan de Valencia (d. after 1427). Fuemariscal de Castilla120 2 and warden of the Alcázares de Zamora.107
3. Alfonso of Valencia. He was alderman of Zamora and member of the Regency Council during the minority of Henry III of Castile.107 And he married Mencía de Quesada, who was the daughter of Pedro Díaz de Quesada, lord of Garcíez, and Juana de Cárcamo.121 107 And after his death his widow married Egas Venegas, III