Neither did I and I thought I knew my Lovecraftian writers (I do not remember the author's name off the top of my head). The Yellow King was a play where everyone who saw it committed suicide due to something in the play. It's on my post-Christmas reading list, because this, this is a moment of shame, so I won't have better detail until I've read it. I blame synecdochic for reminding me how much I love when fanfic fuses to Lovecraft and company.