The characters represented in the "Prometheus" are Strength, Force, Vulcan, Prometheus, Io, daughter of Inachus, Ocean and Mercury. The play opens with the appearance of Prometheus in company with Strength, Force and Vulcan, who have been bidden to bind Prometheus with adamantine fetters to the lofty cragged rocks of an untrodden Scythian desert, because he has offended Jupiter by stealing fire from heaven and bestowing it upon mortals.