Isabel of Portugal, Lady of Viseu (1364-1435), was the natural daughter of King Fernando I of Portugal, from an unknown mother. She married Alfonso Enríquez, Count of Gijón and Noreña, natural son of King Henry II of Castile. Her marriage was one of the clauses of the Treaty of Santarém, signed in 1373, between Portugal and Castile. She was the mother of Constance of Noronha (Constança de Noronha), second wife of Afonso I of Braganza, 1st Duke of Braganza.
Isabel of Portugal, Lady of Viseu (1364-1435), was the natural daughter of King Fernando I of Portugal, from an unknown mother. She married Alfonso Enríquez, Count of Gijón and Noreña, natural son of King Henry II of Castile. Her marriage was one of the clauses of the Treaty of Santarém, signed in 1373, between Portugal and Castile. She was the mother of Constance of Noronha (Constança de Noronha), second wife of Afonso I of Braganza, 1st Duke of Braganza.
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