Angrboda "herald of sorrow" was A giantess who spawned three of the most feared monsters in the world: the great wolf Fenrir, the serpent Jormungand, and the goddess Hel. The father of these three monsters was Loki, god of trickery. Loki was married to the goddess Sigyn, by whom he had two sons, Nari and Vali, but he also created the three monstrous offspring in a peculiar union with Angrboda.
In fact, one could say that Angrboda was the father of the three monsters and Loki was the mother. The monsters were conceived after Angrboda had been burnt by the gods as a witch. Loki was the god who ate her heart. According to the story, the flesh of Angrboda's heart fertilized Loki so that he became impregnated with the monsters. He then gave birth to them. In another legend, Loki also gave birth to Odin's eight-legged horse, Sleipnir, after Loki had transformed himself into a mare.
The offspring of Angrrboda and Loki caused great troubles for the gods. Fenrir the wolf grew so large and strong that the gods had to leash him by trickery with a magic thread. The Midgard serpent, Jormungand (Mighty Monster) was a creature so enormous that it encircled the whole world, its tail in its mouth. The third child, Hel, was banished by the gods to the dark realm of the underworld, where she reigned thereafter as queen.