On topic:
The play Richard the Third is widely regarded to be libellous. However the man himself is dead and nobody takes it seriously as history. So what is the problem?
There's no doubt that the play's a caricature, but the recent discovery of Richard's body has shown that he did have scoliosis - revisionists have held for years that he didn't. Maybe there is a grain of truth in there? Few historians take seriously the idea that Henry VII executed the princes in the tower and most hold that Richard was responsible, from what I have read. We'll never know for sure of course.
The documentary 'The King in the Car Park' was striking not just for the amazing discovery made, but for the personality of Philippa Langley. There was something oddly touching about her devotion but she seems to have the same proprietorial attitude over Richard that a spouse would have.