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In any case, the difference was one of degree rather than principle and should be studied as such. In all trifunctional societies, including those in which clerical status was theoretically hereditary, one finds clerics who were born into either of the two other classes, commoners who were ennobled for their feats of arms or other talents and achievements, clerics who took up arms, and so on.
Piketty on dual-classing in D&D.