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normally plural, singular pseudepigraphon or pseudepigraph
Writings falsely ascribed to famous persons (historical or mythical) to lend them greater legitimacy, typically composed many centuries after the ostensible author's death. quotations examples
The Jewish pseudepigrapha bear the names of Old Testament patriarchs, kings, or prophets.
1906, Henry Barclay Swete, “Authorship”, in The Apocalypse of St. John: the Greek text with introd., notes and indices, Macmillan, page clxx
Now, the myth theory, as it happens, is neither made nor marred by any decision as to the spuriousness of the Pauline letters. The crucial point is that, whether early or late—and the dating of them as pseudepigrapha is a difficult matter—the cardinal epistles have been interpolated.
1916, J. M. Robertson, “The Pauline Problem”, in The Historical Jesus: A Survey of Positions
The difference between a pseudepigraph and a peroration is that the peroration is composed by the author of the main message. A pseudepigraph is composed by a different author, trying to leave the impression that it was the same. Heb 13 is clearly a pseudepigraph.
2006, George Wesley Buchanan, The Book of Hebrews: Its Challenge from Zion, Wipf and Stock, page 415
The title of her[Clare K. Rothschild] monograph Hebrews as Pseudepigraphon13 reflects one of her main claims: "Hebrews should be classified as a Pauline [my italics] pseudepigraphon," because "although Paul's name does not occur in the text, the postscript makes a claim to Paul's authorship, particularly through appropriation of autobiographical details of Paul's life as the author's own."
2021, Gabriella Gelardini, Deciphering the Worlds of Hebrews: Collected Essays, BRILL, page 16