Particularly I'm interested in those historically greyed gradations between what the Greeks called «persuasion» («pathei» if I remember, though I'm probably wrong) and what became, via the Christian
concept of «Truth», «honesty», a
totally alien
concept to the
classical world (for no one was capable of «lieing», then)-- to «persuade», even in the 1300's, with «graphs» would have classed you as a mountebank and a charlatan.