Berchta, goddess of the hunt and protectress of animals in her "white" form. Berchtoldstag is an Alemannic holiday, known in Switzerland, Liechtenstein and the Alsace. It is during the Rauhnächte, in Switzerland always on January 2, with the status of a public holiday. Its observation is attested since the 14th century. The name is related to the Perchta, a female of myth and folklore, guardian of the animals, and sometimes leader of the Wild Hunt.
MANTEGNA Andrea (c.1431-1506), Mantoue, Palais ducal, Castello San Giorgio, Faux oculus de la voûte, fresques de la Chambre des Époux (Gonzague), vers 1465-1474. - ArtPlastoc: 282-DE LA POÉTIQUE DES NUAGES DANS L'ART (1-LA PEINTURE DU XV° AU XIX° S.)