Passage 6.11.1
ἐφεξῆς τούτων ἀναθήματά ἐστιν Ἠλείων, Φίλιππος ὁ Ἀμύντου καὶ Ἀλέξανδρος ὁ Φιλίππου καὶ Σέλευκός τε καὶ Ἀντίγονος· τοῖς μὲν δὴ ἐφʼ ἵππων, Ἀντιγόνῳ δὲ ἀνὴρ πεζός ἐστιν ἡ εἰκών.
Next to these are offerings of the Eleans—Philip son of Amyntas, Alexander son of Philip, Seleucus, and Antigonus. The statues of Philip, Alexander, and Seleucus depict them on horseback, whereas the statue of Antigonus portrays him on foot.