The Greek Titan credited with stealing fire for humanity before Pandora’s creation is Prometheus. His theft is the central act that triggers Zeus’s retaliation in the Pandora story.
Prometheus is portrayed as a friend or benefactor of humans in many classical traditions. In Hesiod’s account, he deceives Zeus during a sacrificial division and later steals fire, hiding it in a stalk before bringing it to mortals. Zeus responds by withholding benefits and arranging a new punishment for humanity.
Pandora’s creation therefore belongs to a chain of cause and effect: Prometheus helps humans, Zeus creates a countermeasure, and Pandora’s jar becomes associated with the troubles that spread through human life. The myth does not say that Pandora herself stole fire or that she was Prometheus’s partner.
Prometheus is often called a god in casual retellings, but he is more specifically a Titan, a member of the older divine generation. He is also the brother of Epimetheus, Pandora’s husband. That family connection helps unify two separate parts of the myth.