|287 BC – 212 BC. Greek mathematician and engineer. Discovered Archimedes' Principle, invented "Archimedes' screw," and built defenses against the Romans for his city of Syracuse; killed by the Romans. | |287 BC – 212 BC. Greek mathematician and engineer. Discovered Archimedes' Principle, invented "Archimedes' screw," and built defenses against the Romans for his city of Syracuse; killed by the Romans. |