Baudolino, by Umberto Eco (2000, Milan)

XII century. Baudolino was born nearby Milan, adopted then by chance by the emperor. He travelled wherever, creating stories and looking for legendary reigns and goblets. He saw mythological creatures and places, then he could tell all his chronicles to a wise man in Costantinopoli.
The main message among these diverse tales is that you can never trust anything, cause most things can be said as lies.