Let us hold our discussion together in our own persons, making trial of the truth and of ourselves.

His death then may be assumed to have occurred circa 420. He immediately took him into his own household and taught him philosophy. Democritus discovered that Protagoras had tied the load himself with such perfect geometric accuracy that it revealed him to be a mathematic prodigy.

490 BC – 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato. He is also believed to have created a major controversy during ancient times through his statement that "man is the measure of all things". Protagoras (pron.