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.
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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.
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Unlike the Oresteia, only one play from this trilogy—Prometheus Bound—survives.