How do we know what Cyrus looked like?......................
“How do we know what Cyrus looked like?”
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Can you prove it doesn’t look like him?
:^)
Seriously, though, I expect it’s something along the line of how you can show a “generic image” of Jesus and most people would identify it as such, even though we don’t know what He looked like. People can even recognize is visage in all manner of thing, such as clouds and taco stains on towels.
Also, there may be some ancient depiction of him on contemporary coinage or a statue - probably not, tho. We have scarce imagery of even the most well known of ancient personages, e.g. Cleopatra.
"Can you dig it?"