Archimedes
Archimedes is one of the most important people in ancient Greece of all times. Because he had just discovered the concept of buoyancy while having a bath, Archimedes is reported to have rushed naked through the streets of Syracuse while shouting, "Eureka! Eureka!"
Even in today's society, he enjoys the same standing and respect as Newton and Einstein. In the Greek period itself, he was referred to as the "wise one" or "the master" and is credited with some theoretical formulations that revolutionized the way things worked and are still used today.
His theories include the "Archimedes Tomb," which shows that a sphere's volume and surface are equal to a cylinder's in two-thirds. When Cicero resurrected it many years later, this well-established thesis had long since vanished from memory. He is most known for using the winning phrase "Eureka" after discovering Archimedes' Principle.
He is also credited with discovering the function of levers, the Archimedes Claw, solstice observations, hydrostatics, and other things. Although his work wasn't well received in antiquity, the authenticity and significance of his life and deeds had a profound influence on subsequent generations.