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* Infanta Isabel of Portugal (born and died 1529), daughter of John III of Portugal;
article may be possible:
* Isabel of Portalegre, Lady of Penela (c. 1292–1367), daughter of Afonso, Lord of Portalegre, and wife of Infante Juan, Lord of Biscaya;
* Isabel Maria Emília de Portugal (1648–1717), great-granddaughter of António, Prior of Crato, disputed King of Portugal, lived in exile in Holland, married baron Adriaan van Gendt;
