The Achilleis (after the Ancient Greek , "Achillēis", ) is a lost trilogy by the Athenian dramatist Aeschylus. The three plays that make up the "Achilleis" exist today only in fragments, but aspects of their overall content can be reconstructed with reasonable certainty. Like the "Oresteia" which forms "a narratively connected unit with a continuous plot," the trilogy had a unified focus, presumably treating the story of Achilles at Troy in a version comparable to the plot of the latter two-thirds of the "Iliad". In the Myrmidons (, "Myrmidónes"), Achilles' refusal to fight after his quarrel with Agamemnon led to the death of Patroclus. The title of the play traditionally placed second in the trilogy is the Nereids (, "Nēreídes"). The chorus was thus a group of Nereids, and the subject of the play involved Achilles and his Nereid mother Thetis, probably her mourning his imminent death and the acquisition of his new arms. In the Phrygians (, "Phrýges") or "Ransom of Hector" (Ἕκτορος λύτρα, "Héktoros lútra"), Priam and a chorus of Phrygians sought to retrieve Hector's body from the still wroth Achilles.