Pythagoras: 1st to call himself a philosopher.
A great mathematician, geometer, pioneer in music theory, theories on celestial bodies. Believed that the soul is immortal and transfers itself into other bodies.
Parmenides: only known work was a poem “ On Nature.” Claimed our body senses are unreliable and true reality can only begotten through reason.
Zeno: know him through the Physics of Aristotle. Inventor of the dialectic( the art of discussing the truth of opinions).
So I talk a lot… 