Whilst the Æsir were building their city, Loki, instead of helping them, had been continually running over to Jötunheim to make friends amongst the giants and wicked witches of the place. Now, amongst the witches there was one so fearful to behold in her sin and her cruelty, that one would have thought it impossible even for such an one as Loki to find any pleasure in her companionship: nevertheless, so it was that he married her, and they lived together a long time, making each other worse and worse out of the abundance of their own wicked hearts, and bringing up their three children to be the plague, dread, and misery of mankind. These three children were just what they might have been expected to be from their parentage and education. The eldest was Jörmungand, a monstrous serpent; the second Fenrir, most ferocious of wolves; the third was Hela, half corpse, half queen. When Loki and his witch-wife looked at their fearful progeny they thought within themselves, "What would the Æsir say if they could see?" "But they cannot see," said Loki; "and, lest they should suspect Witch-wife, I will go back to Asgard for a little while, and salute old Father Odin bravely, as if I had no secret here." So saying, Loki wished his wife good-morning, bade her hide the children securely in-doors, and set forth on the road to Asgard. But all the time he was travelling Loki's children went on growing, and long before he had reached the lofty city Jörmungand had become so large, that his mother was obliged to open the door to let his tail out. At first it hung only a little way across the road; but he grew, Oh, how fearfully Jörmungand grew! Whether it was from sudden exposure to the air, I do not know; but, in a single day he grew from one end of Jötunheim to the other, and early next morning began to shoot out in the direction of Asgard. Luckily, however, just at that moment Odin caught sight of him, when, from the top of Air Throne, the eyes of this vigilant ruler were taking their morning walk. "Now," said Odin, "it is quite clear, Frigga, that I must remain in idleness no longer at Asgard, for monsters are bred up in Jötunheim, and the earth has need of me." So saying, descending instantly from Air Throne, Odin went forth of Asgard's golden gates to tread the earth of common men, fighting to pierce through Jötunheim, and slay its monstrous sins.