Always there had been war between the Giants and the Gods--between the Giants who would have destroyed the world and the race of men, and the Gods who would have protected the race of men and would have made the world more beautiful. There are many stories to be told about the Gods, but the first one that should be told to you is the one about the building of their City. The Gods had made their way up to the top of a high mountain and there they decided to build a great City for themselves that the Giants could never overthrow. The City they would call "Asgard," which means the Place of the Gods. They would build it on a beautiful plain that was on the top of that high mountain. And they wanted to raise round their City the highest and strongest wall that had ever been built. Now one day when they were beginning to build their halls and their palaces a strange being came to them. Odin, the Father of the Gods, went and spoke to him. "What dost thou want on the Mountain of the Gods?" he asked the Stranger. "I know what is in the mind of the Gods," the Stranger said. "They would build a City here. I cannot build palaces, but I can build great walls that can never be overthrown. Let me build the wall round your City." "How long will it take you to build a wall that will go round our City?" said the Father of the Gods. "A year, O Odin," said the Stranger. Now Odin knew that if a great wall could be built around it the Gods would not have to spend all their time defending their City, Asgard, from the Giants, and he knew that if Asgard were protected, he himself could go amongst men and teach them and help them. He thought that no payment the Stranger could ask would be too much for the building of that wall. That day the Stranger came to the Council of the Gods, and he swore that in a year he would have the great wall built. Then Odin made oath that the Gods would give him what he asked in payment if the wall was finished to the last stone in a year from that day. The Stranger went away and came back on the morrow. It was the first day of Summer when he started work. He brought no one to help him except a great horse. Now the Gods thought that this horse would do no more than drag blocks of stone for the building of the wall. But the horse did more than this. He set the stones in their places and mortared them together. And day and night and by light and dark the horse worked, and soon a great wall was rising round the palaces that the Gods themselves were building. "What reward will the Stranger ask for the work he is doing for us?" the Gods asked one another. Odin went to the Stranger. "We marvel at the work you and your horse are doing for us," he said. "No one can doubt that the great wall of Asgard will be built up by the first day of Summer. What reward do you claim? We would have it ready for you."