‘The Old English cnafa refers to a boy servant, or young male servant. We confirm this with its German cognate Knabe, which is an old term for boy. So knaves were originally young boys who attended to knights. But when the institution of knighthood crumbled at the end of the sixteenth century, and when lords realized they could hire cheaper and better professional armies, hundreds of knaves found themselves unemployed. So they did what any young men down on their luck would do – they fell in with highwaymen and robbers and became the lowlife scoundrels that we label as knaves now. So the
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