Carneades (; , "of Carnea"; 214/3–129/8 BC) was an Academic skeptic born in Cyrene. By the year 159 BC, he had started to refute all previous dogmatic doctrines, especially Stoicism, and even the Epicureans whom previous skeptics had spared. As head of the Academy, he was one of three philosophers sent to Rome in 155 BC where his lectures on the uncertainty of justice caused consternation among the leading politicians. He left no writings and many of his opinions are known only via his successor Clitomachus. He seems to have doubted the ability, not just of the senses but of reason too, in acquiring truth. His skepticism was, however, moderated by the belief that we can, nevertheless, ascertain probabilities of truth, to enable us to live and act correctly.