Herbert Stammelford was a mage and a member of the Council of Wizards. He was also the author of Dialogues on the Nature of Magic, which was one of tomes Ciri studied in Ellander under the tutelage of Yennefer.
It's stated that Stammelford once moved a mountain because it obstructed the view from his tower, having been able to do so because he commanded a d'ao, an Earth genie.
- In The Witcher (PC) there is a high-quality black powder called Stammelford's dust.
- In The Witcher 2: Assassins of Kings, there's a potion called Stammelford's philtre.
- In The Witcher 3: Wild Hunt, there is an alchemy ingredient called Stammelford's dust.
- See the GWENT standalone game version card: Stammelford's Tremor