Chichevache (AKA anchevache or thingut) is a mythical female monster, believed to have survived by eating good and virtuous women.
Fables describe Chichevache as a thin cow-faced creature. It was said to be poorly nourished because virtuous women were rare.
Chichevache had a male counterpart, the bicorn (also spelt bicorne or bycorne), which was supposed to have eaten good, kind, loyal and obedient men. The bicorn was well built and healthy, supposedly due to the abundance of good men to feed upon.
Chichevache featured in Chaucer's Canterbury Tales. Many French poets also have written ballads about Chichevache and Bicorns.