Lisette de Lapin

Lisette de Lapin was a French witch who was convicted of practicing witchcraft by Muggles in the city of Paris in 1422. She disappeared from her prison cell the evening before her scheduled execution.

Animagus theory
One theory is that she was an Animagus whose animal form was small enough to allow her to slip out the barred window. This idea has never been confirmed, but, sometime after Lisette's escape, a large white rabbit was spotted sailing across the English Channel in a cauldron. A rabbit fitting that description would later serve as an advisor to King Henry VI.

Inspiration for "Babbitty"
Magical historians have suggested that Lisette de Lapin may have been the inspiration behind Beedle the Bard's character Babbitty, who turns into a rabbit to escape the foolish King and charlatan.

Etymology
Lisette is a French nickname of Elisabeth. Lapin is the French word for rabbit, which combined with the the particle de ("of") to form the surname de Lapin, can be interpreted as meaning either "of the rabbit" or "of a place called Lapin."

Appearances

 * The Tales of Beedle the Bard