In Greek mythology, Alcyoneus was the antagonist of the hero Heracles. He was considered to be one of the Gigantes, the children of the Titans Uranus and Gaea. In the Gigantomachy, the war that happened between the Giants and the Olympians, Heracles and Alcyoneus fought each other. However, Alcyoneus was immortal while stepping on his native land and would revive if anyone would try to kill him. So, when Heracles hit him with an arrow and Alcyoneus was about to stand up again, Athena advised Heracles to drag him out of his homeland; that was how Alcyoneus died. Alcyoneus had seven daughters called Alkyonides, who threw themselves into the sea after their father died.