Who is High-Priestess Bacbuc from Gargantua and Pantagruel and what is their importance?

High-Priestess Bacbuc greets Pantagruel and his men at the Temple of La Dive Bouteille. She tells them that the water in the fountain will taste like whatever wine they think of while they drink it. Bacbuc then leads Panurge to La Dive Bouteille and explains the word uttered she gives them.