Wolfsbane Potion was invented by Damocles Belby in the recent past. 【1】This achievement was likely the reason he was awarded an Order of Merlin. 【2】
【1】Harry Potter and the Prisoner of Azkaban, Chapter 18 (Moony, Wormtail, Padfoot and Prongs), page 258 "The Potion that Professor Snape has been making is a very recent discovery...Before the Wolfsbane Potion was discovered, however, I became a fully fledged monster once a month 【when I went to Hogwarts】"
【2】Harry Potter and the Half-Blood Prince, Chapter 7 (The Slug Club)
(其实就是斯拉格霍恩又教了发明者的侄子,试图拉家常然后发现叔侄没联系所以就对侄子失去兴趣的一小段)