Darth Ruin: The Forgotten Sith

I recently discovered thanks to a youtube video that if it wasn't for Darth Ruin, there would have been no brotherhood of darkness,no destruction of the jedi order, no order of the Sith Lords, and no One Sith. Yet His name isn't in the history books of Korriban.

He's in the Book of Sith, and The Jedi Path.