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.
Conan the Barbarian
The various stories of Conan the Barbarian occur in the pseudo-historical "Hyborian Age", set after the destruction of Atlantis and before the rise of any known ancient civilization. This is a specific epoch in a fictional timeline created by Howard for many of the low fantasy tales of his artificial legendary.