The Prometheia () is a trilogy of plays about the titan Prometheus. It was attributed in Antiquity to the 5th-century BC Greek tragedian Aeschylus. Though an Alexandrian catalogue of Aeschylean play titles designates the trilogy Hoi Prometheis ("the Prometheuses"), in modern scholarship the trilogy has been designated the Prometheia to mirror the title of Aeschylus' only extant trilogy, the Oresteia. Unlike the Oresteia, only one play from this trilogy—Prometheus Bound—survives. Inasmuch as the authorship of Prometheus Bound continues to be debated, the very existence of a Prometheus trilogy is uncertain. To the extent that modern scholars postulate the existence of such a trilogy by a single author, the consensus holds that it comprised Prometheus Bound, Prometheus Unbound, and Prometheus the Fire-Bringer, in that order. Prometheus Bound The dramatis personae are Prometheus, Cratus (Power), Bia (Violence), Hephaestus, the mortal woman Io, Oceanus, Hermes and a chorus of Oceanids. The play is composed almost entirely of speeches and contains little plot since its protagonist is chained and immobile throughout. At the beginning, Cratus, Bia and Hephaestus the smith-god chain Prometheus to a mountain in the Caucasus and then depart. According to Aeschylus, Prometheus is being punished not only for stealing fire (theft of fire), but also for thwarting Zeus' plan to obliterate the human race. This punishment is especially galling since Prometheus was instrumental in Zeus' victory in the Titanomachy. The Oceanids appear and attempt to comfort Prometheus by conversing with him. Prometheus cryptically tells them that he knows of a potential marriage that would lead to Zeus' downfall. Oceanus later arrives to commiserate with Prometheus, as well; he urges the Titan to make peace with Zeus, and departs. Prometheus is then visited by Io, a maiden pursued by a lustful Zeus. The Olympian transformed her into a cow, and a gadfly sent by Hera has chased her all the way from Argos; Prometheus forecasts her future travels, telling her that Zeus will eventually end her torment in Egypt, where she will bear a son named Epaphus. He adds that one of her descendants (Heracles), eleven generations hence, will release him from his own torment. Finally, Hermes the messenger-god is sent down by an angered Zeus to demand that Prometheus tell him who threatens to overthrow him. Prometheus refuses, and Zeus strikes him with a thunderbolt that plunges Prometheus into the abyss. Prometheus Unbound Only eleven fragments of Prometheus Unbound survive, in