Oh, yeah, I'm not arguing that. You'd think given a few millennia someone would try something besides rock and feather, or any other light object with significant air resistance. It's mystifying how religiously they took Aristotle on all subjects, by the way, not just gravity. Nearly everything wrong with science for the next thousand years can be attributed to him, or a misinterpretation of him.
Math, according to my possibly faulty: Aristotle tutored Alexander the Great, who peaked around 320s BC. The Macedonian era was either the last gasp of Greek superiority or by some accounts post-Greek. Rome was already on the rise, and soon to eclipse it. Greek history definitely goes back another thousand years before that or more, though by 1600 BC I think you're deep into the realm of Homer already.