About Theseia
The Theseia (Ancient Greek: Θησεῖα, Thēseĩa) was an ancient Greek festival held in Athens in the honor of Theseus. This festival was first implemented in the 470s BCE, after an Athenian general known as Cimon son of Miltiades attacked the island of Skyros in search of the bones of Theseus, after receiving instructions from an oracle of Delphi to go there. Once he defeated the local Dolopians, he scoured the island and found a tomb of a gigantic man that he would proclaim to be the remains of Theseus and would bring them back to Athens for proper burial.
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