Hercules was half man and half god. His mother was some mortal. But his father was a king somewhere the mighty Zeus. But Hercules did not know he was part god until he had grown into a man.
Right from the beginning, Hera, Zeus' wife, was very jealous of Hercules. She tried all kinds of ways to kill him, including sending a couple of big snakes into his crib. Hercules crushed those snakes in a flash! Hercules was incredibly strong, even as a baby!