"Folk horror" is a retrospective label. Director Piers Haggard first used the phrase in a 2003 Fangoria interview to describe his own 1971 film, but the term only entered wide circulation after actor and writer Mark Gatiss featured it in his 2010 BBC documentary series A History of Horror. Gatiss grouped three films together as an "Unholy Trinity" β a shared obsession with the British landscape, its buried folklore, and the superstitions that never quite went away β and the label stuck so completely that it now retroactively organises decades of earlier and later work under a single genre banner.