Μαραθωνομάχης
From LSJ
Καλὸν τὸ μηδὲν εἰς φίλους ἁμαρτάνειν → Nihil peccare in amicos est pulcherrimum → Gut ist, sich gegen Freunde nicht versündigen
English (LSJ)
[μᾰχ], ου, ὁ,
A one who fought at Marathon: prov. of a veteran, Ar.Ach.181, Nu.986:—also Μᾰρᾰθωνο-μάχος, ὁ, APl.4.233.8 (Theaet.), D.L.1.56, and v.l. Ar.Nu.l.c.