3. Four letters of St. Isidorus, of Pelusium, written about the beginning of the fifth century after Christ, are addressed to a person named Nemesius, in one of which he is called Ἄρχων, Praetor (1.47, ed. Paris, 1638), but it is not quite certain that the same individual is meant in each instance (2.135, 4.39, 5.36).