Through a royal letter issued on 2 October 1377, her father granted her the Lordship of
Viseu,
Celorico,
Linhares and
Algodres.
She left to the
Royal Court of King
Henry II of Castile where she lived while waiting for an appropriate age to get married. They finally married in November 1377[1] in the city of
Burgos. This marriage gave rise to the
Noronha family, still represented in several
aristocratic houses, both in
Portugal and in
Spain.
João de Noronha,[3] participated in the siege of
Balaguer and was knighted by InfanteDuarte in the siege of
Ceuta where he was injured. He died from his wounds shortly afterwards without having left any offspring.
Isabella eventually returned to her native
Portugal where her uncle, King
John I of Portugal, gave her a warm welcome and protection, both to her and to her children.
Menéndez Pidal de Navascués, Faustino (1982). Instituto Luis de Salazar y Castro (ed.). Heráldica medieval española: la Casa Real de León y Castilla (in Spanish). Vol. I. Madrid: Hidalguía.
ISBN8400051505.
Sousa, António Caetano de (1946). História Genealógica da Casa Real Portuguesa (in Portuguese). Vol. I. Coimbra: Atlântida-Livraria Editora, Lda.
OCLC829426236.
"Nobreza de Portugal e Brasil" – Vol. II, pages 234/235. Published by Zairol Lda., Lisbon 1989.