Hercules. Hercules had died and ascended to Olympus by the time Achilles was born. This is also evidenced by that the fact that in the Trojan War, Philoctetes had Hercules' bow and arrows, given to him by Hercules upon his death.
Chat with our AI personalities
Both Herclues and Achilles were born half-god, Hercules by his father: Zeus, and Achilles by his mother: Thetis. Thetis further attempted to make Achilles invulnerable by dipping him in the Styx.
Perseus is Hercules great grandfather. Ancestors of Perseus and Hercules - Everything2.com
Achilles, Hercules, and Odysseus
amazing strength
The answer is Prometheus. In the course of Hercules travels, he came upon Prometheus, (chained to the mountain), and set him free.