Hadean
The Hadean () is a geologic eon of the Earth pre-dating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago. , the ICS describes its status as ""informal"". Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the "Priscoan period", from "priscus", the Latin word for "ancient". Other, older texts simply refer to the eon as the Pre-Archean.
Hades
Hades obtained his wife and queen, Persephone, through abduction at the behest of Zeus. This myth is the most important one Hades takes part in; it also connected the Eleusinian Mysteries with the Olympian pantheon, particularly as represented in the "Homeric Hymn to Demeter", which is the oldest story of the abduction, most likely dating back to the beginning of the 6th century BC. Helios told the grieving Demeter that Hades was not unworthy as a consort for Persephone: