What is "pierronne"

Pierronne, also known as Pierrone, Pierronne la Bretonne and Perrinaïc, was a 15th-century Breton woman who said she saw visions of "God dressed in a long white robe with a red tunic underneath". Pierronne, who may have met Joan of Arc in 1429, tried to defend her reputation at Corbeil. For this, Pierronne was arrested in March 1430 and burned at the stake on 3 September 1430.