Zeus swore that the next son born of the Perseid house should become ruler of Greece, but-by a trick of Zeus’s jealous wife, Hera-another child, the sickly Eurystheus, was born first and became king.
Traditionally, Heracles was the son of Zeus and Alcmene ( see Amphitryon), granddaughter of Perseus.
Heracles (Greek Herakles, Roman Hercules) was one of the most famous Greco-Roman legendary heroes.