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Urraca was born in Coimbra in 1148. She was the daughter of Afonso I, the first king of Portugal, and Maud of Savoy. She had several siblings, including Sancho I. In May or June 1165, Urraca married Ferdinand II of León. The only son of this marriage, Alfonso IX, was born in Zamora on 15 August 1171. The marriage of Ferdinand II and Urraca was annulled in 1171 or 1172 by Pope Alexander III because the two were second cousins, great-grandchildren of Alfonso VI of León and Castile.