Author (widely believed)
Cantankerus Nott (fl. 1930s) was a wizard and a member of the pure-blood Nott family who is widely believed to have been the one who penned the Pure-Blood Directory — a book listed the "twenty-eight truly pure-blood families" with "the aim of helping such families maintain the purity of their bloodlines" — that was published anonymously in Britain in the early 1930s.
- "Cantankerous" is a word meaning ill-tempered, surly, argumentative, and uncooperative.
- Pottermore (Mentioned only)