Queen Mab (poem)

When the Lone Cyberman invaded Villa Diodati in 1816, it recited a poem, saying "He cherisheth the snakes that gnaw his heart and he raises up the tyrant whose delight is in his woe." The poem was a work by Percy Bysshe Shelley. 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.