In Norse mythology

Norse mythology

Norse mythology, a subset of Germanic mythology, is the overall term for the myths, legends and beliefs about supernatural beings of Norse pagans. It flourished prior to the Christianization of Scandinavia, during the Early Middle Ages, and passed into Nordic folklore, with some aspects surviving...

, Hreiðmarr is the avaricious king of the Dwarves, who captured three gods with his unbreakable chains. He was father of Fafnir

Fafnir

In Norse mythology, Fáfnir or Frænir was a son of the dwarf king Hreidmar and brother of Regin and Ótr. In the Volsunga saga, Fáfnir was a dwarf gifted with a powerful arm and fearless soul. He guarded his father's house of glittering gold and flashing gems...

, Ótr

Ótr

In Norse mythology, Ótr is a dwarf. He is the son of the king Hreidmar and the brother of Fafnir and Regin....

 and Regin

Regin

Reginn, often Anglicized as Regin, in Norse mythology, was the son of Hreiðmarr and foster father of Sigurd. His brothers are Fafnir and Ótr. When Loki mistakenly kills Ótr, Hreiðmarr demands to be repaid with the amount of gold it takes to fill Ótr's skin and cover the outside. Loki takes this...

. He owned a house of glittering gold and flashing gems built by Regin and guarded by Fafnir. After Otr was accidentally killed by Loki

Loki

In Norse mythology, Loki or Loke is a god or jötunn . Loki is the son of Fárbauti and Laufey, and the brother of Helblindi and Býleistr. By the jötunn Angrboða, Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr. By his wife Sigyn, Loki is the father of Nari or Narfi...

, the Æsir

Æsir

In Old Norse, áss is the term denoting a member of the principal pantheon in Norse paganism. This pantheon includes Odin, Frigg, Thor, Baldr and Tyr. The second pantheon comprises the Vanir...

 repaid Hreiðmarr with Andvari

Andvari

In Norse mythology, Andvari is a dwarf who lives underneath a waterfall and has the power to change himself into a fish at will. Andvari had a magical ring Andvarinaut, which helped him become wealthy....

's gold and the cursed ring Andvarinaut

Andvarinaut

In Norse mythology, Andvaranaut is a magical ring capable of producing gold, first owned by Andvari.The mischievous god Loki tricked Andvari into giving Andvaranaut to him...

. Fafnir and Regin killed Hreiðmarr for the ring. Fafnir decided he wanted Andvarinaut for himself, so he turned into a dragon and drove Regin away.