His brother, having brought anarchy to Portugal by an unfortunate
          marriage was forced to go into exile and died in Spain, deserted by
          the wife for whom he had lost his throne. As a result, Alfonso III
          succeeded his brother as King of Portugal in 1248. He continued and
          completed the reconquest of lands lost to the Moors and
          consequently was the first Portugese monarch to be styled 'King of
          Portugal and the Algarves'.
              In 1253 he divorced his wife and, according to some, contracted a
          bigamous marriage with Beatrice, an illegitimate daughter of King
          Alfonso X of Castile. His first wife died in 1262 and a year later
          Pope Urban IV regularized the second marriage, thus removing the
          stigma of illegitimacy from his son, Diniz. Alfonso III was the first
          Portugese sovereign to call a Cortes, the beginnings of parliamentary
          government.
 

Source: Leo van de Pas