Frau Holle

Frau Holle also called Hulda is in old German Mythology the goddess of the dead. She plays a prominent part in German folk-lore and superstition. In stormy nights she can be often heard flying through the air, accompanied by weird spirits and witches. On such occasions it is dangerous for ill-doers to be abroad, as they will surely meet with severe punishment; while to the good she frequently appears as a benefactor. Her particular season is winter; when it snows she is shaking her featherbed.)

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Encyclopaedia of Superstitions, Folklore, and the Occult Sciences