First magistrate attested in Athens in 74/73 BC: See M. Thompson, The New Style Silver Coinage of Athens (1961) no. 1231 /
her issue 89 (p. 562); C. Habicht, Zu den Münzmagistraten der Silberprägung des Neuen Stils, Chiron 21, 1991, p. 6 (74/73
BC, his issue 91); Prosopographia Attica 4423; P. M. Fraser – E. Matthews, A Lexicon of Greek Personal Names II Attica (1994)
p. 132 s. v. Diophantos, no. 17; W. Leschhorn, Lexikon der Aufschriften auf griechischen Münzen II (2009) p. 463 s. v. Diophantos.