Kalaratri (sometimes spelled Kaalratri) is the seventh of the nine forms of the Goddess Durga, known as the Navadurga. She is first referenced in the Durga Saptashati, Chapters 81-93 of the Markandeya Purana, the earliest known literature on the Goddess Durga. Kalaratri is widely regarded as one of the many destructive forms of the Mother Goddess, which include Kali, Mahakali, Bhadrakali, Bhairavi, Mrityu, Rudrani, Chamunda, Chandi and Durga. Other less well-known names of Goddess Kaalratri include Raudri and Dhumorna.