Of thousands of Abhang poems credited to Namdev, 600 - 700 are probably authentic.[7] The other poems are attributed to Namdev, in a phenomenon Novetzke calls, "anamnetic authorship".[42] The later compositions and their authors hid the true authorship purposefully and collectively over the 14th to 18th centuries, a period described in Maharashtra culture as the dark age.[43] This was a period of Muslim conquest and repression of Hindus under the Delhi Sultanate and the Mughal Empire.[43] The literary works not composed by Namdev, but attributed to Namdev were partly a product of this historical suffering and political situation in Deccan region of India