Mathematicians like Plato (also a philosopher) and Pythagoras. Pythagoras created the Pythagorean Theorem, in 530 BC, which stated that, in a right triangle, the square of a (a²) plus the square of b (b²) is equal to the square of c (c²), otherwise known as a²+ b²= c². China began making cast iron in 500 BC and the Roman Aqueducts, which Romans used springs in hilly regions and built the Aqueduct at a certain angle to ensure that the water would fall the necessary distance.
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Roman Empire
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200 -(-500) = 2500, but since there is no year 0 then it is 2499 years ago
Cleopatra V11 MAde 500 ships.
There were alliances between them, which shifted according to circumstances. As the Persian threat emerged, they took sides, some with Persia, a couple of dozen led by Sparta, against Persia.