Who is Plato from A History of Western Philosophy and what is their importance?

Plato was born in 428-7 BC, during the beginning of the Peloponnesian War in an aristocratic family. He regarded Sparta well because of the influence of Pythagoras, Parmenides, Heraclitus, and Socrates. He drew on Orphic elements through Pythagoras along with religion, adhering to immortality. He was mainly interested in mathematics and mysticism. Plato believed in eternity, timelessness, and uncertainty while considering the most beneficial a static perfection in state and Godly rulers.