 After favorable reader reaction to John Constantine 's appearances in the comic book series Swamp Thing , where he had been introduced by Alan Moore during his authorship of the title , the character was given his own comic book series in 1988 . The series was intended to bear the title <unk> , but this title was revised before publication due to the contemporaneous release of Clive Barker 's unrelated film of the same name . Initial writer Jamie Delano was , in his own words , " fairly ambivalent " about the change of title . 
