Pythagoras created the Pythagorian Theorom that helped mathmeticians throughout the decades. Pythagoras was a mathmetician, philosopher, and a scientist.
An acropolis was a military center that was high up on a hilltop. Every Greek city had an acropolis.
Aristarchus was the scientist who found, that Earth had an axis, that Earth went around the Sun and that the Moon goes around the Earth.
Homer was a playwright who wrote a very famous play called "The Odyssey" and was written in many languages. The play was mostly about the Greek gods.
Alexander the Great was a mighty emperor who conquered a lot of land and began at a young age. As a boy he was taught by Aristotle who gave him a lot of knowledge in many subjects. As Alexander began conquering land he also spread the knowledge he had that was given to him by Aristotle.