Page "Granny Weatherwax" Paragraph 1

She is a very powerful witch, and is reckoned to be more powerful than the most well-known witch on the Discworld, Black Aliss ( real name: Aliss Demurrage ), who is responsible for any number of witcheries in fairy tales, such as putting a castle to sleep and getting pushed into her own oven by naughty kids.

It does seem that her teacher's teacher's teacher's teacher was Black Aliss.

(" I learned my craft from Nanny Gripes, who learned it from Goody Heggety, who got it from Nanna Plumb, who was taught it by Black Aliss ..." – Granny, in Lords and Ladies ).

From the triple nature of a coven ( maiden, mother, and crone ), it has been suggested that she embodies all three, although the crone is the most obvious.

In any case, this appellation is tactfully avoided in her presence.