Multiple choice general knowledge Who replaced the Fat Lady in the third book after attack by black dog? One-eyed crone Sir cadogan Peeves Bloody boron Reveal answer Fill a bubble to check yourself B Correct answer Explanation In Harry Potter and the Prisoner of Azkaban, after Sirius Black attacks the Fat Lady, she is temporarily replaced by Sir Cadogan, a brave but eccentric knight portrait. This occurs while the Fat Lady recovers from her injuries.