In that case, he was a grandson of Euthydemus whom he qualified on his coins as "Basileas Theos" ("Βασιλέας Θεός" Greek for "God-King").
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Agathocles issued a series of "pedigree" dynastic coins, probably with the intent to advertise his lineage and legitimize his rule, linking him to Alexander the Great, a king Antiochus Nikator (Greek: "Νικάτωρ" "Victorious", probably intended is Antiochus III), the founder of the Greco-Bactrian kingdom Diodotus and his son Diodotus II, Euthydemus, Pantaleon, and Demetrius.
Justin's Demetrius may have been a relative of the Indian king Apollodotus I or a fugitive prince of the Euthydemid dynasty.
Euthydemus II, (2nd century BC) a ruler of the Greco-Bactrian Kingdom
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Euthydemus I, (3rd century BC) a ruler of the Greco-Bactrian Kingdom
The descendants of the Greco-Bactrian king Euthydemus invaded northern India around 180 BC as far as the Punjab.
The kings Pantaleon, Antimachus, Agathocles and possibly Euthydemus II ruled after Demetrius I, and theories about their origin include all of them being relatives of Demetrius I, or only Antimachus.