Prometheus was Pandora’s husband Epimetheus’s brother and the conceptual opposite of his “afterthought” name.
Epimetheus and Prometheus are Titan brothers in Greek mythology. Their names are traditionally contrasted: Prometheus is associated with foresight, while Epimetheus is associated with thinking afterward. That contrast appears in the story of Pandora because Prometheus warned his brother not to accept gifts from Zeus, yet Epimetheus accepted Pandora.
Prometheus had already angered Zeus by helping humanity, especially through the theft of fire. Pandora’s arrival and the opening of her container form part of the punishment that followed. The brothers therefore represent two different responses to danger: anticipating consequences and recognizing them too late.
The names are meaningful literary labels rather than ordinary character descriptions. Ancient Greek myths vary in detail, but the brother relationship and the contrast between foresight and afterthought are central features of their traditional presentation.