Afonso, Hereditary Prince of Portugal (1526) explained

Afonso, Hereditary Prince of Portugal was the first son of king John III of Portugal and his queen, Catherine of Austria.^[1] He was the Prince of Portugal but died in the same year he was born, in 1526.^[2]

Notes and References

1. Book: Pereira . Esteves . Rodrigues . Guilherme . Portugal: diccionario historico, chorographico, heraldico, biographico, bibliographico, numismatico e artistico . 1904 . J. Romano Torres . Lisboa . 1045 . (in Portuguese)
2. Book: McMurdo . Edward . The history of Portugal, from the Commencement of the Monarchy to the Reign of Alfonso III . 1889 . Sampson Low, Marston, Searle, & Rivington. London . 152 . 4 December 2023.