Durga, in her various forms, appears as an independent deity in the Epics period of ancient India, that is the centuries around the start of the common era. Both Yudhisthira and Arjuna characters of the Mahabharata invoke hymns to Durga. She appears in Harivamsa in the form of Vishnu's eulogy, and in Pradyumna prayer. Various Puranas from the early to late 1st millennium CE dedicate chapters of inconsistent mythologies associated with Durga. Of these, the Markandeya Purana and the Devi-Bhagavata Purana are the most significant texts on Durga. The Devi Upanishad and other Shakta Upanishads, mostly dated to have been composed in or after the 9th century, present the philosophical and mystical speculations related to Durga as Devi and other epithets, identifying her to be the same as the Brahman and Atman (self, soul).
