Foreseeing a negative economic effect of a similar Jewish flight from Portugal, King Manuel issued his decree four years later largely to appease a precondition that the Spanish monarchs had set for him in order to allow him to marry their daughter. While the stipulations were similar in the Portuguese decree, King Manuel largely prevented Portugal's Jews from leaving, by blocking Portugal's ports of exit. He decided that the Jews who stayed accepted Catholicism by default, proclaiming them New Christians. Physical forced conversions, however, were also suffered by Jews throughout Portugal.