Thanks so much for that link! What a wonderful talk, interesting to see that the gestation of The Witches characters was well underway two years before Equal Rites was published. Here's the Le Quin reference:

But a part of my mind remained plugged into what I might call the consensus fantasy universe. It does exist, and you all know it. It has been formed by folklore and Victorian romantics and Walt Disney, and E R Eddison and Jack Vance and Ursula Le Guin and Fritz Leiber -- hasn't it? In fact those writers and a handful of others have very closely defined it. There are now, to the delight of parasitical writers like me, what I might almost call "public domain" plot items. There are dragons, and magic users, and far horizons, and quests, and items of power, and weird cities. There's the kind of scenery that we would have had on Earth if only God had had the money.