Gilles de Rais (also spelled Retz) (September 10, 1404 –
October 26, 1440) was a French noble, soldier, and one
time brother-in-arms of Joan of Arc, but is perhaps best
known as a prolific serial killer.
He is distinguished also by his integration of his
daily prayers with his nightly crimes, both of them
being for him a path to ecstasy.
Gilles de Rais -
Tale of Terror