Sancho was an experienced warrior against the Moors and, after
          1185 when he succeeded his father as King of Portugal, continued his
          efforts against them. However, in 1192 he signed a truce which allowed
          him the opportunity to repair old city walls and build new cities,
          which earned him the nickname of 'the City Builder'.
              The latter part of his reign was taken up with ecclesiastical
          disputes with the Portugese bishops supported by Pope Innocent III.
          The disagreements were mainly over church revenues but he was also
          accused by the Bishop of Coimbra of giving refuge to a witch in his
          palace. The king then imprisoned the Bishop of Oporto but he escaped
          five months later and fled to Rome. As a result, Portugal was placed
          under a papal interdict which was lifted in 1210, when Sancho
          submitted, allowing the Bishop of Oporto to return and pay the Pope
          one hundred marks in gold.
 

Source: Leo van de Pas