Equus is a play by Peter Shaffer written in 1973, telling the story of a psychiatrist who attempts to treat a young man who has a pathological religious/sexual fascination with horses.
Shaffer was inspired to write Equus when he heard of a crime involving a 17-year-old who blinded six horses in a small town near London. He set out to construct a fictional account of what might have caused the incident, without knowing any of the details of the crime. The play's action is something of a detective story, involving the attempts of the child psychiatrist, Dr. Martin Dysart, to understand the cause of the boy's actions while wrestling with his own sense of purpose.
However, numerous other issues inform the narrative. Most important are religious and ritual sacrifice themes, and the manner in which character Alan Strang constructs a personal theology involving the horses and the supreme godhead, "Equus". Alan sees the horses as representative of God and confuses his adoration of his "God" with sexual attraction. Also important is Shaffer's examination of the conflict between personal values and satisfaction and societal mores, expectations and institutions. In reference to the play's classical structure, themes and characterization, Shaffer has discussed the conflict between Apollonian and Dionysian values and systems in human life.