I'm thinking one could go in many directions with such an assignment. Lots of Shakespeare's sonnets, for example:
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Peacock's War Song shows a hateful use of power:
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Browning's Pied Piper has power over rats and children. Keats's La Belle Dame has power over her palely loitering knight. And, as Desi notes, many of Browning's Monologues show one person's power over another (Porphyria's Lover and The Laboratory for examples).