His strength was only second to that of his father, Zeus, and almost no other God could best him in strength. The Greek hero, Hercules, was one of the strongest beings in the world during his time. It was said that he was so strong that even most of the Gods can’t best him in strength but how strong exactly was the Demi-god, Hercules? Considered to be the strongest of all of Zeus’ children, Hercules was exceptionally strong even though he was just a Demi-god.