What then became of me? I know not; I lost sensation, and chains and darkness were the only objects that pressed upon me. Sometimes, indeed, I dreamt that I wandered in flowery meadows and pleasant vales with the friends of my youth, but I awoke and found myself in a dungeon. Melancholy followed, but by degrees I gained a clear conception of my miseries and situation and was then released from my prison. For they had called me mad, and during many months, as I understood, a solitary cell had been my habitation.
– Mary Shelley
Frankenstein, Chapter 23. Following the deaths of Elizabeth and his father, Victor has a mental breakdown and ends up in a dungeon accused of being mad.