It is now 50 years since the infamous horror film 'The Exorcist' made its way into cinemas, creating a rapid reputation which would go on to see it become a cult classic in the genre as well as spawning a raft of other franchise material which was not foreseen or intended.

The recent death of the movie's director William Friedkin has brought to the forefront once more the important legacy which 'The Exorcist' has created. It is far more than simply a horror classic. It is a part of our social history, providing a cultural commentary on the world.

In terms of folklore, it is based on a series of events which actually happened (whatever they may have been) and as well as drawing on these it shines a light on the often dangerous world of exorcism today.

Film historian, broadcaster and author Nat Segaloff joins us to discuss 'The Exorcist' and it role in our society.