In Norse mythology, Gleipnir was the third chain used to tie up Fenrir, the wolf. Fenrir was the son of Loki and Angrboða, the giantess. The first two chains, named Lædingr and Dromi, were forged by Thor and did not hold him. Gleipnir was created by the sons of Ivaldi and did hold Fenrir. It was as thin as spider's silk. Gleipnir was made from six things: 