According to legend, Tiryns was founded by Proitos. He had the fortification wall of Tiryns built by Cyclops from Lycia.[2] Proitos was the brother of Acrisios, whose grandson Perseus is said to have founded Mycenae in Tiryns during his reign. Two generations later, Heracles served King Eurystheus, grandson of Perseus, for twelve years to atone for the killing of his own children. During this time he completed his famous twelve labors. Part of the legend about the hero Bellerophon is also based in Tiryns.