Justin (Marcus Junianus Justinus)
Justin lived during the 3rd century AD,
meaning somewhere between the years 201 and 300 AD.
Epitome, which is a
compilation of quotations from the book Historiae Philippicae et
totius mundi origines et terrae situs (Philippic Histories) by
Pompeius Trogus, plus Justin's own comments.
Justin mentions the
Battle of Marathon but the good man lived about 700 years
after the event, so his report is a little iffy.