Cain is the only play written by George Gordon Lord Bryon. It is considered a closet drama, which means you better not let anyone catch you reading it, so grab a flashlight and your script and go hide in--

No, as you know, a closet drama is a play meant to be read only, not staged. However, way back when, it was staged at a small theatre on Fourteenth St. between Sixth and Seventh Avenues (I think) called the Classic Theatre, and I played the Angel of the Lord. In the picture, I'm putting a mark on Cain's forehead to protect him from harm by those who might want to kill him for his heinous act of fratricide.

[Sorry to say, other than this picture, I've misplaced any record of the show and don't currently recall the actor's name who played Cain.]