Benedict IX

Benedict IX was a pope in the 11th century who founded the Haereticum. She had a relationship of familiarity with the Doctor, knowing that he lived a life of regret. A painting of her guarded the entrance to her library of heresies. (TV: Extremis)

Behind the scenes

 * In the real world, there has been much dispute over whether Pope Benedict IX was male or female, as there are documents dating back the the 13th century, speaking of a female Pope disguised as a man. This documentation is strongly believed in the world of today to be fiction.