In Hesiod’s Pandora story, Prometheus is Pandora’s brother-in-law and humanity’s benefactor.
Prometheus is the Titan who, in a related Greek myth, steals fire for humans after Zeus withholds it. Hesiod connects him to Pandora through his brother Epimetheus: Prometheus warns Epimetheus not to accept gifts from Zeus, but Epimetheus accepts Pandora. The stories therefore place Prometheus on the human side of the conflict with Zeus, while Pandora becomes part of Zeus’s response.
Later writers and modern retellings often make Prometheus the central hero of the combined myth. In Hesiod, however, the fire theft and Pandora episode are distinct sections of a broader explanation for human suffering and labor.
Prometheus is not Pandora’s creator, husband, or the person who opens the jar. He is her brother-in-law through Epimetheus. The Greek myths also portray him as a trickster figure, so his protection of humanity is accompanied by punishment from Zeus.