Whose dog was Gelert?

More than seven hundred years ago, the Prince of Wales had a very big and brave dog, Gelert. One day the Prince wanted to go hunting with his men. He told his dog to stay at home and look after his baby son. The baby was in a wooden cradle, which was like a small bed.
    When the Prince came back from hunting, Gelert ran out to meet his master. Then the Prince saw blood on Gelert’s jaws and head.
    "What have you done?" The Prince said. He rushed into his home and looked for his baby son. The cradle was lying on its side on the floor. The clothes were torn and there was blood on them.
    "So you killed my son!" the Prince said angrily. "You unfaithful dog!" He took out his sword and killed the dog.  Just as Gelert was dying, he managed to bark for a moment. Then the Prince heard a baby call to the dog.
    The Prince ran out of the house and saw his son lying on the ground unhurt. Near him was a dead wolf. Then the Prince knew that Gelert had defended the baby and killed the wolf.
    The Prince ran back into the house but he was too late. Gelert was dead. The Prince was very sad indeed. Tears ran down his face when he realized he had killed his faithful friend. After this, the Prince never smiled again. Every morning at dawn, he walked up the mountain so that he could stand by the dog’s grave for a few minutes.