In Greek mythology, Eurystheus was the king of Tiryns, a stronghold near Mycenae. He was the son of Sthenelus and Nicippe, grandson of Perseus. Hera and Zeus quarreled at who would be the hero that would destroy all the monsters of the previous era, in order to establish the new age of the Twelve Olympians.

Is Eurystheus a mortal?

EURYSTHEUS - the Greek legendary mortal (Greek mythology)

How is Eurystheus related to Hercules?

Eurystheus is Hercules' cousin and king of Mycenae and Tiryns. After Hera had tricked an oath out of Zeus that the boy born that day who was his descendant would become king, she caused Eurystheus to be born early and Hercules, who was due, was held back until Eurystheus was born.