King Alfonso VI of Portugal ruled from 1656-1667. Despite numerous physical and mental handicaps, he was able to bring about an end to his mother's regency, and to fend of a Spanish invasion. In this film, the king's wife has joined forces with those who would dethrone him. In a trial before the papal legate, his sexual deficiencies were exposed, and his marriage to his French queen was annulled and he was imprisoned. She went on to marry the man who was to become Alfonso's regent and later became the next king, Peter II. This elegant historical drama, filmed on location in palaces that were in use at the time, tells the story of his fall from power, and of the trial.