Queen Mab (poem)

"Queen Mab" was a work by Percy Bysshe Shelley. When the Lone Cyberman invaded Villa Diodati in 1816, it recited Shelley's work, saying "He cherisheth the snakes that gnaw his heart and he raises up the tyrant whose delight is in his woe." This startled Mary Shelley, who gasped and wondered how the Cyberman knew Percy's words. (TV: The Haunting of Villa Diodati)

Behind the scenes
In the episode The Haunting of Villa Diodati, the Lone Cyberman quotes lines from the stanza "The Fairy" from Percy Shelley's large poetic work "Queen Mab". However, the poem is not referred to by name in the episode.