hallucinaut

noun

A person who is hallucinating.

Ravaillac, who assassinated Henri IV., imagined that he smelt fire and brimstone exhaling from his feet; he beheld figures dancing before him, ...and one day he fancied that he saw a deaths head upon a statue, all which with many other hallucinations induced him to believe that his victim had been sentenced to be damned, and that it was necessary that he should perish by his hand. The details of the cruel execution of this hallucinaut need not here be recapitulated.