The most common version of this trope is an archeologist, explorer or other researcher (or group thereof) misidentifying what an ancient object was for. The broadest scope versions are about cataclysms from way back in the past that got turned into a mythical event or messiah, and a subtrope of the religious version is when the objects of adoration are from pop culture.
How far back can we trace this trope, at least in speculative fiction? My previous bound was Arthur C. Clarke with History Lesson (1949), but Brave New World has Henry Ford as a messiah, and I'm interested in going even farther back. As a note, prefer listing examples where the characters are fooled and the author isn't.