Details on Theseus > Theseus Basics
The legendary Greek hero Theseus was the son of Aethra, a daughter of King Pittheus (son of Pelops) of Troezen, and either the Athenian king Aegeus or Poseidon. When counted as Poseidon's son, Theseus is one of the demigods. Theseus was a Greek hero second only to Hercules in Athens, where Theseus is counted one of the early kings.
Theseus took part in a prodigious number of adventures -- some noble, some not so much. His thoughtlessness led his father to leap to his death and his lack of commitment led to the abandoning of his first love interest, Ariadne. Don't worry about her, though: she did better for herself when she married a full-fledged god, Dionysus.
Theseus took part in A great number of stories including these major adventures: