There is an untold tale in Norse mythology of the unknown romance of Loki the God of Mischief. It is a common misconception that Loki desired and married a nymph that Odin made a Goddess, named Sigyn, and that he later attempted to leave her, although she remained loyal to him until the end, and attempted to relieve his suffering from the poison of the snake the Goddess Skaði set over him before Ragnarök as he lay bound by their son Narfi's guts to three snaptun stones.
Only two pieces of this information are correct. That Loki loved a nymph, and that another nymph by the name of Sigyn was involved, although whether she is real or not is contested.
It was a love that belonged to myths and legends, and yet never made it to any of the history books. A love that changed both of their lives forever more. A love whose strength bound them together until beyond the veil, and transcended all lives. A love Loki never knew himself to be capable of. A love with a nymph called Káta.
There are two schools of thought to this story; two separate tales that tell the fate of Loki and his lover.
One is that Loki fell in love with, and wooed the nymph Káta, and that she in turn fell in love with him. With the aid of the Goddess Lofn they persuaded Odin to marry them. However, the Gods were not pleased with this outcome, for in his quest to win over Káta's heart, Loki showed himself to be of a more steadfast and honourable nature than his role as the God of Mischief allowed. So the two were united on the condition that the mortals of Midgard knew nothing of the marriage, for the Gods required Loki's image as a dishonourable trickster to remain intact for the Midgardians to believe in, and rather the fabrication of Sigyn was related to them. To this Loki and Káta acquiesced. Loki in particular was pleased with the outcome for it gave him some little leverage over the other Gods and Goddesses in other matters untold here, and the two were married to their great and everlasting happiness.
The other tale is that while Loki truly loved and was successful in his pursuit of the nymph Káta, their love was kept secret from the other Gods and Goddesses, save Var and Lofn. However, unbeknownst to anyone but Odin and Frigg, Loki had been arranged to marry the nymph Sigyn in an attempt to calm his antics. When the lovers discovered this they bound themselves to each other with oaths that united their spirits, though they could never be together in life. Káta insisted that Loki fulfil his duty to Sigyn in marrying her and upholding his word, despite the fact that it had been Odin and Frigg that had pledged him on his unwitting behalf. Thus, Loki married Sigyn, and did his duty by her, although his heart was forever in Káta's keeping, and hers in his. Following the marriage, Káta is said to have changed her name to Eilíf, meaning 'always alone in life', and became the spirit of a well. It is said by some that when Loki heard of this he would spend hours gazing into the water and would see Káta's reflection smiling back at him.
This is the first tale.