Eurynomos is a demon in Greek mythology, sometimes identified with Hades (or Orcus in Roman mythology) and sometimes said to be a servitor of Hecate. The creature is now mostly known by association with the black metal musician Euronymous, who took his stage name from this figure, claiming the name meant 'Prince of Death'. It is more likely that Euronymous took the name from a reference to Eurynomos in the Satanic Bible than from any direct mythological readings, as Eurynomos is either a minor figure whose associated literature is lost to time, or an invention by the painter Polygnotos.

[In a painting of Hades by Polygnotos at Delphi, Phokis] Eurynomos, said by the Delphian guides to be one of the daimones of Hades, who eats off all the flesh of the corpses, leaving only their bones. But Homer’s Odyssey, the poem called the Minyad, and the Returns, although they tell of Hades and its horrors, know of no daimon called Eurynomos. However, I will describe what he is like and his attitude in the painting. He is of a colour between blue and black, like that of meat flies; he is showing his teeth and is seated, and under him is spread a vulture’s skin.” -Pausanias 10.28.7

A character called Eurynomos does show up in The Odyssey, but he is a human, the third son of Aigyptios, and has no relation to the demon described by Pausanias.