Latin writers framed Greek sources on Islam as fabulous yet truth-bearing

Evidence

The Greeks are the inventors or writers of almost all the arts. Their wit—ancient and modern—fills many Latin books. There is no story so fabulous that it does not contain some pure truth to be found hiding inside it, if it is sought out eagerly using that light which Latin vigilance can strike from the Greeks’ flint. Among these sayings of the Greeks are those which they relate about the Saracens. These I have collected as so many encyclopedic curiosities and have disposed them in proper style in the present work. — John V. Tolan, Saracens, 743