Katyayani is the sixth form of Goddess Durga, she is the sixth among Navadurgas. She is seen in the form of Goddess Durga killing Mahishasur and known as Mahishasur Mardini as well.
StoryEditThere once was a sage named Katyayan, who had a son named Katya. The wish of sage Katyayan was that Mother Goddess should take birth in his house as his daughter, to please the Goddess, sage Katyayan performed austere penance for many years. Finally, the Goddess was pleased, by accepting Katyayan's prayer, she took in his house in the form of a daughter. Because of this, the Mother Goddess's sixth manifestation was called Katyayani. Also it is said that Parvati transformed into Katyayani, with Durga's shape and she killed Mahishasur after a long duel.