"Madman, as in 'lunatic'; from the Old French lunatique, in turn heralding from Late Latin, lunaticus, meaning 'moonstruck'. Yes, a popular theory, especially given the etymology, but one ultimately without factual basis. The moon is just the moon, and lunar cycles – which I have well enough knowledge of," he said as an aside, "have no bearing on the character of a man. The moon controls the tides, and nothing more."