John Chortasmenos (Greek: Ἰωάννης Χορτασμένος; c. 1370 – before June 1439) was a Byzantine monk and bishop of Selymbria, who was a distinguished bibliophile, writer, and teacher.
[1] An ardent bibliophile, Chortasmenos is notable both as a writer as well as a teacher, counting scholars Mark of Ephesus, Bessarion and Gennadius Scholarius among his pupils.
[1] He wrote a hagiography of Constantine the Great and Helena of Constantinople, commentaries on John Chrysostomos and Aristotle, a treatise on hyphenation, as well as poems.
[1] Among the more notable is the Juliana Anicia Codex of Dioscurides, which he had restored, rebound, and a table of contents and extensive scholia added in Byzantine Greek minuscule in 1406.
"[4] In 2013, Italian Philologist and historian of Mathematics Fabio Acerbi showed that Chortasmenos wasn't cursing Diophantus because of the same passage next to which Fermat wrote his theorem (II.8), but because of the far more difficult II.7.