Letitia Ketterley (or Aunt Letty) was Digory Kirke's aunt, sister to his mother and his uncle Andrew Ketterley. She was unmarried, and resided in a house in London with her brother and housemaid, Sarah, at which Digory stayed while his mother was ill. She was known to be "a tough old lady"; strict but fair, though she was not tolerant with women with bare arms. Apparently, she was also known to work with her hands, as she was seen mending a mattress by herself on the floor of her house, which was lucky since she fell on it after being thrown across the room by the evil witch-queen Jadis.