In Norse mythology, Asgard is the realm of the gods, the Æsir, thought to be separate from the realm of the mortals, Midgard. The walls surrounding Asgard were built by a giant, in return for which he was to receive in payment the hand of Freya in marriage and the sun and the moon. This was agreed provided that the work was completed within six months. In order to avoid the payment, Loki transformed himself into a mare and lured away the giant's magic horse, Svadilfari. The job was not completed on time and the gods evaded the payment.
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