Graham Bruce Hancock is a British writer who promotes pseudoscientific theories involving ancient civilizations and hypothetical lost lands. Hancock speculates that an advanced ice age civilization was destroyed in a cataclysm, but that its survivors passed on their knowledge to hunter-gatherers, giving rise to the earliest known civilizations of ancient Egypt, Mesopotamia, and Mesoamerica.

The Sign and the Seal: The Quest for the Lost Ark of the Covenant is a pseudoarchaeological 1992 book by British author Graham Hancock, in which the author describes his search for the Ark of the Covenant and proposes a theory of the ark's historical movements and current whereabouts. The book sold well but received negative reviews.