| Moreover, many of them provide evidence of embellishment and invention that were introduced to serve the purposes of political or religious apologetic | 597, which notes that many of the details surrounding Muhammad's life as given in the biographies, are "problematic in certain respects, the most important of which is that they represent a tradition of living narrative that is likely to have developed orally for a considerable period before it was given even a relatively fixed written form |
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| 137 Netanel's work was virtually unknown beyond his native Yemen until modern times, so had little influence on later Jewish thought• The Bustan al-Ukul, by Nathanael ibn al-Fayyumi, edited and translated by David Levine, Columbia University Oriental Studies Vol | however, there is no relevant archaeological, epigraphic, or numismatic evidence dating from the time of Muhammad, nor are there any references to him in non-Muslim sources dating from the period before 632 |
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See, for example, Bowersock, Glen Warren, Peter Robert Lamont Brown and Oleg Grabar Late Antiquity: A Guide to the Postclassical World 1999, Harvard University Press p.