280s BC births

Archimedes of Syracuse ( ; ) was an Ancient Greek mathematician, physicist, engineer, astronomer, and inventor from the city of Syracuse in Sicily. Although few details of his life are known, based on his surviving work, he is considered one of the leading scientists in classical antiquity, and one of the greatest mathematicians of all time. Archimedes anticipated modern calculus and analysis by applying the concept of the infinitesimals and the method of exhaustion to derive and rigorously prove many geometrical theorems, including the area of a circle, the surface area and volume of a sphere

Chinese Legalist, 280–233 BCE

3rd-century BC Greco-Roman dramatist and epic poet

Chinese politician of the Qin Dynasty

thumb|Ctesibius' water clock, as visualized by the 17th-century French architect Claude Perrault

ancient Greek engineer

Greek astronomer and mathematician (c.280–c.220 BC)

Buddhist monk of 3rd century BC

King of Cyrene

ancient Greek mathematician

Sphaerus (, sometimes transliterated as Sphaeros;

concubine; mother of Qin Shi Huang