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Theseus ( ) was the myth founder-king of Athens, son of Aegeus and Poseidon, both of whom Aethra had slept with in one night. Theseus was a founder-hero, like Perseus, Cadmus, or Heracles, all of whom battled and overcame foes that were identified with an archaic religious and social order. As Heracles was the Dorian hero, Theseus was the Athenian founding hero, considered by them as their own great reformer: his name comes from the same root as ("thesmos"), Greek for "institution". He was responsible for the synoikismos ("dwelling together")—the political unification of Attica under Athens, represented emblematically in his journey of labours, subduing highly localized ogres and monstrous beasts. Because he was the unifying king, Theseus built and occupied a palace on the fortress of the Acropolis that may have been similar to the palace that was excavated in Mycenae. Pausanias reports that after the synoikismos, Theseus established a cult of Aphrodite Pandemos ("Aphrodite of all the People") and Peitho on the southern slope of the Acropolis.

Thus Theseus was raised in his mother's land. When Theseus grew up and became a brave young man, he moved the rock and recovered his father's tokens. His mother then told him the truth about his father's identity and that he must take the sword and sandals back to king Aegeus to claim his birthright. To journey to Athens, Theseus could choose to go by sea (which was the safe way) or by land, following a dangerous path around the Saronic Gulf, where he would encounter a string of six entrances to the Underworld, each guarded by a chthonic enemy. Young, brave, and ambitious, Theseus decided to go alone by the land route and defeated a great many bandits along the way.

When Theseus arrived at Athens, he did not reveal his true identity immediately. Aegeus gave him hospitality but was suspicious of the young, powerful stranger's intentions. Aegeus's wife Medea recognized Theseus immediately as Aegeus' son and worried that Theseus would be chosen as heir to Aegeus' kingdom instead of her son Medus. She tried to arrange to have Theseus killed by asking him to capture the Marathonian Bull, an emblem of Cretan power.

On the way to Marathon, Theseus took shelter from a storm in the hut of an ancient woman named Hecale. She swore to make a sacrifice to Zeus if Theseus were successful in capturing the bull. Theseus did capture the bull, but when he returned to Hecale's hut, she was dead. In her honor Theseus gave her name to one of the deme of Attica, making its inhabitants in a sense her adopted children.

Theseus has not been a contender in any CBUB matches.