Joan of Arc
When Joan of Arc was put on trial, she said no to the customary courtroom rules about a witness's oath. She said she would not answer every question about her visions. She complained that the normal witness oath would not be right because she had an oath that she had given to the king. It is not known how much the record which reports this has been changed by dishonest court officials or her possible lies to protect state secrets. Some historians simply say that her belief in her duty was more important than where the visions came from.