Brains beat brawn. The Titan Prometheus knew that. He joined Zeus in his battle against the Titans.
Prometheus later befriended the race of men. He saved them when Zeus thought about extinguishing them. He taught them arts and science. He gave them tools. Zeus increasingly found Prometheus’ promotion of the human race tiresome and troublesome.
And then Prometheus gave humans the gift of fire, in direct violation of Zeus’ orders.
Zeus was livid. He ordered Prometheus bound: Kratos (Power) and Bia (Force) held him while Hephaestus fettered him to a chain on a crag hanging over the Black Sea. An eagle came every day and ate his liver, which regenerated every night.