O stormy peple! Unsad and evere untrewe!
Ay undiscreet and chaungynge as a fane!
Delitynge evere in rumbul that is newe,
For lyk the moone ay wexe ye and wane!
Ay ful of clappyng, deere ynogh a jane!
Youre doom is fals, youre constance yvele preeveth;
A ful greet fool is he that on yow leeveth.
– Geoffrey Chaucer
The Canterbury Tales, The Clerk’s Tale. The Clerk is angry and critical of the local people for switching their loyalties from Griselda to her younger replacement. He labels them false, delighting in rumors, their constancy proving evil. And he uses a number of similes to describe them as changing like a weather vane, and like the moon ever waxing and waning.