Not knowing that this was a grove sacred to Mars, and a fountain that had never been polluted by mortal touch, Cadmus stooped to drink, when suddenly, out of the deep shadows of the cave, rushed a huge dragon with crested head and glittering scales and a triple tongue vibrating between triple rows of teeth. This monster, twisting his body into a huge coil, darted toward Cadmus with gleaming fangs; but the young prince dealt his assailant a terrific blow that pierced the dragon in a vital spot, and it rolled over dead upon the floor of the cave. Then Cadmus heard a voice telling him to take out the dragon's teeth and to sow them in the ground where he wished to build his future city of Thebes. As soon as the teeth were sown, a crop of giants in glittering armor sprang up out of the ground, and when they were about to turn their spears upon Cadmus, he again heard the voice--this time bidding him throw a stone into the midst of the armed men. This caused a terrific battle to begin among the giants themselves, and soon they were all killed except five who laid down their weapons and offered their services to Cadmus. As a punishment for the desecration of his grove and the slaying of its sacred guardian, Mars compelled Cadmus to serve him for eight years. At the end of this time the prince was made ruler of the new city of Thebes, and Mars so far forgave the sacrilege of his grove as to give Cadmus his daughter Harmonia in marriage. The career of the new king was very prosperous at first, and Cadmus was supposed to have contributed a great boon to his people by the invention of the alphabet. Later on he incurred the wrath of the gods by forgetting to offer them suitable sacrifices, and both he and his wife Harmonia were changed into serpents. Just above the city of Athens was a hill called the Areopagus (from the Greek word meaning Mars Hill), which received its name from a famous trial that took place there. Neptune's son had carried off the daughter of Mars; and when the god of war learned of the abduction, he hurried after the daring youth and killed him. Then Neptune demanded that Mars should be punished for his deed of blood; and to decide the matter, both were summoned to appear before a court of justice, which was held on the hill above Athens. As it was the custom for all important cases to be tried at night, so that the judges might not be prejudiced by the favorable appearance of either party, the court assembled in the darkness, and Mars told the story of his daughter's capture and his own subsequent revenge. In spite of Neptune's objections to what he considered an unfair verdict, the judges decided in favor of Mars, and he was therefore acquitted. The hill was afterwards called by his name, and the judges of the principal court of justice were always termed _areopagitæ_. III