Mainly fiction, not so much myths or legends.
It would be worth x-posting this to /r/AskLiteraryStudies. Meanwhile, here are some previous posts that may be of interest
What other Latin Novels do we know of? - various Greek works
What is the world's first novel? - Satyricon
What is the earliest known fiction book, and what was it about? - epic poems, Tale of Genji, Don Quixote, various
Was the Canterbury Tales the first English novel? - Don Quixote, Robinson Crusoe
Where did Robinson Crusoe diverge from previous writing styles enough to cause it to be considered one of the first novels instead of an older type of writing? - Robinson Crusoe