Allopanishad
Allah-Upanishad or Allopanishad is a Sanskrit apocryphal text with many Arabic words generally argued and believed to be written in India in 16th century during the reign of the Mughal emperor Akbar. It describes Akbar as a messenger or prophet of God.
The Allopanishad is not part of the Upanishad canon, traditionally containing 108 Upanishads, and does not appear in any Vedas. In an issue of The Theosophist, R. Ananthakrishna Sastri wrote that the work was written by converted Muslims for monetary rewards during the time of Muslim rule in India. He further remarked that the work was not in the style of ordinary Upanishads and its words appear to sound more like Arabic. Jogendra Nath Bhattacharya and B. K. Sarkar categorize Allopanishad as an Islamic Work and write that it was written by a converted Muslim courtier of Akbar, as an apocryphal chapter of the Atharvaveda. Swami Vivekananda said, “I have been told that Allopanishad was written during the reign of Akbar, to bring the Hindus and Mahommedans together, and sometimes they got hold of some word, as Allah, or Illa in the Samhitas, and made an Upanishad on it. So in this Allopanishad, Mahomet is the Rajasulla, whatever that may mean.”