Cthulhu - first published in 'Weird Tales' as a short story in 1928 called 'The Call of Cthulhu' Cthulhu represents humanities underlying despair and anxiety. A number of short stories followed which later became the basis of a religion that is practiced in countries around the world, from NewZealand to Europe and even in Asia.
Jörmungand and also known as the Midgard Serpent (Old Norse: Midgarðsormr), or World Serpent, who is a titanic sea serpent, and the middle child of the giantess Angrboða and the God Loki. Jörmungandr's arch-enemy is the God Thor.
"In Norse mythology, Jörmungandr, or 'Midgarðsormr' was a sea serpent so long that it encircled the entire world, Midgard. Some stories report of sailors mistaking its back for a chain of islands. Sea serpents also appear frequently in later Scandinavian folklore, particularly in that of Norway."