In Irish and Celtic legend, a mischievous fairy queen known for causing troublemaking and mayhem, appearing in works like Shakespeare's Romeo and Juliet.
From Old Irish 'Medb,' a legendary queen, but in English literature especially through Shakespeare's characterization, where she became the Fairy Queen of dreams and pranks.
Queen Mab inspired one of Shakespeare's most famous descriptions of fairies—she travels in a tiny carriage drawn by atomies, making mischief and nightmares—and this one description basically became how English writers imagined all fairies forever after.
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