Marcus, Diadochus, who flourished probably in the 4th century, was the author of a short treatise entitled τόυ μακαρίου Μάρκου του Διαδόχου κατὰ Α᾿ρειανῶν λόγος, Beati Marci Diadochi Sermo contra Arianos, published with a Latin version by Jos. Rudolph. Wetstenius, subjoined to his edition of Origen, De Oratione (Basle, 1694, 4to; reprinted with a new Latin version in the Bibliotheca Patsrumn of Galland, v. 242). See Fabricius, Bibl. Graeca, 9:266 sq.; Cave, Hist. Litt. ad ann. 356, 1:217; Galland, Biblioth. Patrum, Proleg. ad vol. v, c. 14; Smith, Dict. of Greek and Romans . Biog. and Mythol. s.v.