The accuracies of the following can be argued:

"Tell me, who are the Spartans?"
--Cyrus the Great, according to Herodotus (kind of a premonition)

And my favorite (note that the exact wording varies, depending on the source):
"O man, whoever you are and wherever you come from, for I know that you will come–I am Cyrus, who founded the Empire of the Persians and was king of the East. Do not begrudge me this spot of earth which covers my body.”
I think this it Plutarch's version of the inscription. It's been weathered away over the centuries so we can't verify what it actually said (or if it even said anything).