#OTD in 1816.
At the Villa Diodati, Lord Byron reads Fantasmagoriana to Percy Shelley, Mary Shelley, Claire Clairmont, and John Polidori, then challenges each to write a ghost story, culminating in Mary Shelley’s Frankenstein, John Polidori’s story “The Vampyre,” and Byron’s poem “Darkness.”
Fantasmagoriana:
https://en.wikipedia.org/wiki/Fantasmagoriana
The Vampyre:
https://www.gutenberg.org/ebooks/6087
Frankenstein:
https://www.gutenberg.org/ebooks/84