Agrippa (1st/2nd century AD)

Agrippa, a Sceptic of the first or second century ad, compiled five general modes of Sceptical argument: the views of positive theorists are subject to endemic disagreement due to the relativity of appearances, and adjudication cannot succeed, since it will either be mere assertion (and hence will not command assent) or appeal to further considerations, which process will either be infinitely regressive or circular, or terminate in unfounded assumption.