Valdemar is a fictional character created by the American author Edgar Allan Poe. He appears in Poe's short story titled "The Facts in the Case of M. Valdemar," published in 1845. In the story, Valdemar is a man who is hypnotized while on his deathbed, leading to a series of eerie events that explore themes of life, death, and consciousness. The narrative raises questions about the nature of reality and the boundaries between life and death. Valdemar's condition blurs these lines, making him a subject of fascination in discussions about hypnosis and the supernatural. The story remains a notable example of Gothic literature.