Polyxena Being Executed by Neoptolemus

From the Getty Museum record

Achilles’s son Neopotelmus sought to avenge the death of his father after the Greek conquest of Troy. Even though the well-known Greek hero Achilles had fallen in love with Polyxena, the princess of Troy, she devised a plan to end the life of the great warrior, which Neopotelmus then avenged. Polyxena offered her throat to Neopotelmus willingly, which is perhaps why the artist has shown the princess with her hands folded in prayer like a saintly Christian martyr.