Millions of souls have lived upon our islands. In the huge majority of cases nothing of their existence remains except yellowing documents in the care of half-forgotten institutions and perhaps a simple stone monument, overgrown in a dank churchyard. But others have left a greater psychic imprint on these shores.
Some have forseen the future or communed with the dead. Others have wreaked bloody havoc on the communities in which they lived. Others yet have found themselves immortalised in infamy by challenging authority and the shared morality under which we all ostensibly live.
Today, these people are commemorated in stone or song - or perhaps they live among us still behind the walls of prisons or institutions dedicated to the study of the mind.
And, of course, what is today considered 'madness' can become tomorrow's orthodoxy... and vice-versa.