The epilepsy charge against Muhammad began with the Byzantine chronicler Theophanes

Evidence

Theophanes is the first author to charge Muhammad with being an epileptic, an accusation that will be repeated by many later polemicists; see Astérios Argyriou, “Éléments biographiques concernant le prophète Muhammad dans la littérature grecque des trois premiers siècles de l’Hégire,” in Toufic Fahd, ed. — John V. Tolan, Saracens, 1560

Categorization

• XREF: Direct origin of the ‘Muhammad the epileptic fraud’ medicalized-debunking trope that persists in modern Islamophobic polemic — exactly the genealogical grounding the reader seeks.
• SEED: Article angle: tracing the epilepsy accusation as the first medicalized ‘explanation’ of revelation — a precursor of modern debunking of religious experience as pathology.
• ADDENDUM: Supports claims that dismiss revelation via physical/medical diagnosis — relevant to the moral-panic and dehumanization analytics in the vault.