Objective Truth

“One of the longest running debates in philosophy is whether it is possible to discover any objective truth, or whether all knowledge is relative to the subject. Describe how these two perspectives are evidenced in early Greek philosophy (up to and including Plato and critically assess the arguments you find there for and against the possibility of objective knowledge”.

“Arguments derived from probabilities are idle.”
Plato
Introduction
It is safe to assume that our ancestors (several million years ago) managed to take time from their survival tasks of food gathering, mating, hunting and killing, to lean on their hoes and gaze up at the sky (Branigan, 1986). It was perhaps at that moment that mankind first began to think about its existence on earth.
We do know that from ancient times man has wondered about the essence of knowledge, and the existence of truth, particularly in the works of Heraclitus, Protagarus, Phaedrus, Parmenides, Theatetus, Gorgias, Socrates, Plat...