pseudepigrapha

/ˌs(j)uː.dəˈpɪ.ɡɹə.fə/
noun
  1. 1

    Writings falsely ascribed to famous persons (historical or mythical) to lend them greater legitimacy. They were typically composed many centuries after the ostensible author had died.

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Source: https://en.wiktionary.org/wiki/pseudepigrapha