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Xenophanes of Colophon (570 - 475 BC) was an Ancient Greek philosopher, theologian, poet, and social and religious critic. He lived a life of travel, having left Ionia at the age of 25 and continuing to travel throughout the Greek world for another 67 years. Knowledge of his views comes from fragments of his poetry, surviving as quotations by later Greek writers. To judge from these, his elegiac and iambic poetry criticized and satirized a wide range of ideas, including Homer and Hesiod, the belief in the pantheon of anthropomorphic gods and the Greeks' veneration of athleticism. He is credited with being one of the first philosophers to distinguish between true belief and knowledge, which he further developed into the prospect that you can know something but not really know it. Engraving from The History of Philosophy by Thomas Stanley published in three successive volumes between 1655 and 1661.