Infanta Mafalda of Portugal was a Portuguese infanta, the second child and first daughter of Afonso I of Portugal and his wife Maud of Savoy. OnJanuary 1159, when Mafalda was ten years old, her marriage was agreed with then Infante Alfonso of Aragon , who was seven. That would have made Mafalda the putative Queen consort of Aragon. However, the marriage did not happen, since the young infanta died in early 1160. This did not compromise the establishment of longlived good relations between Portugal and Aragon, since Mafaldas younger brother Infante Sancho would marry Dulce of Barcelona, Infanta of Aragon, sister of Alfonso II in 1175.
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Source: Wikipedia