Episteme
"Episteme" is a philosophical term derived from the Ancient Greek word ἐπιστήμη "epistēmē", which can refer to knowledge, science or understanding, and which comes from the verb , meaning "to know, to understand, or to be acquainted with".
Traditional story
An etiological myth, or origin myth, is a myth intended to explain the origins of cult practices, natural phenomena, proper names and the like, or create a mythic history for a place or family. For example, the name Delphi and its associated deity, "Apollon Delphinios", are explained in the Homeric Hymn which tells of how Apollo carried Cretans over the sea in the shape of a dolphin (') to make them his priests. While Delphi is actually related to the word ' ("womb"), many etiological myths are similarly based on folk etymology (the term "Amazon", for example). In the "Aeneid" (published circa 17 BC), Vergil claims the descent of Augustus Caesar's Julian clan from the hero Aeneas through his son Ascanius, also called Iulus. 
The story of Prometheus' sacrifice-trick in Hesiod's "Theogony" relates how Prometheus tricked Zeus into choosing the bones and fat of the first sacrificial animal rather than the meat to justify why, after a sacrifice, the Greeks offered the bones wrapped in fat to the gods while keeping the meat for themselves.