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.
Agathocles | Bactria | Demetrius I of Bactria | Agathocles (grandson of Agathocles of Syracuse) | Demetrius, qualified as "ANIKETOS", i.e. "Invincible" (Pedigree coin minted by Agathocles of Bactria | Bactria (satrapy) | Agathocles of Bactria |
He was never defeated in battle and was posthumously qualified as the Invincible (Aniketos) on the pedigree coins of his successor Agathocles.