OK fOLKS..As someone rightfully pointed out before, the title is Greatest dancehall Reggae artist of all time.
Please do your research. Bob Marley didn't do dancehall but he is the King of Reggae music. As a matter of fact he created the first international reggae album & put reggae on the world scene. Most people don't know this.
Bob Marley converted to Christianity, got baptised before one year before he died. So he's singing reggae in heaven.
As far as the greatest dancehall artist, that title would go to Buju Banton.