Medieval critics accused Muhammad of mixing Jewish and Christian heresy

Evidence

59. Summula and Gerald, loc. cit., Alan, op. cit. rv.i. Other examples: annotator, ad Az. 11 (Bibl. p. 224); Mark, Pref. Q.; Fidenzio, xiv; Rod., Hist. Arab. 111; Paris’s additions to St Albans Chr.; Pedro de Alfonso alleged that the Christian influence on Muhammad was Jacobite (by which he probably meant Nestorian; he clearly had no comprehension of the meaning of Jacobite) and the Jewish equally heretical: Samaritan, in fact; this suggests loyalty to his former co-religionists. Varagine, following him, noted that both Jacobite and Nestorian had been suggested (op. — Norman Daniel, Islam and the West, 2278

Categorization

• XREF: Connects to the vault’s thread on ‘Islam’ as constructed constitutive outside — this shows the mechanism of construction is categorizing Islam as polluted fusion of existing enemies (heresy on both sides).
• ADDENDUM: Complicates the genealogical claim that Islam was posited as wholly Other; here Islam is framed as a degradation that draws on both Jews and Christians, a hybrid contaminant.