I have not read it but I do know that archaeologists found the city of Troy where the poem indicated it had been, that had previously been regarded as fiction invented by Homer, so it has at least some historical references. But otherwise I believe it presents itself only as a romantic fiction.
Seriously, now.
This is Spinal Tap.
It presents itself, straight through, as a documentary about a rock band. However, the rock band in question never existed. The movie is a spoof.
While we're at it...
The Office,
The Blair Witch Project,
It's a Good Life if You Don't Weaken, the writings of Herodatus... they all present themselves as fact. None of them actually are.
"You can't expect him to be answering your prayers when he's not real, can you? That's like writing to the characters of a soap opera and expecting a reply, Mr. Silly Sausage!"
-Jane Christie