In Greek mythology, Aegeus (//; Ancient Greek: Αἰγεύς, romanized: Aigeús) was an archaic figure in the founding myth of Athens. The "goat-man" who gave his name to the Aegean Sea was, next to Poseidon, the father of Theseus, the founder of Athenian institutions and one of the kings of Athens.
Aegeus was the son of Pandion II, king of Athens and Pylia, daughter of King Pylas of Megara and thus, brother to Pallas, Nysus and Lykos. But, in some accounts, he was regarded as the son of Scyrius or Phemius and was not of the stock of the Erechtheids, since he was only an adopted son of Pandion.
Aegeus was born in Megara where his father Pandion had settled after being expelled from Athens by the sons of Metion who seized the throne. After the death of Pandion, now king of Megara, Aegeus in conjunction with his three brothers successfully attacked Athens, took control over the government and expelled the usurpers, the Metionids. Then, they divide the power among themselves but Aegeus obtained the sovereignty of Attica, succeeding Pandion to the throne. It has been said that Megara was at the time a part of Attica, and that Nisus received his part when he became king of that city. Lycus became king of Euboea whereas Pallas received the southern part of the territory. Aegeus, being the eldest of the brothers, received what they all regarded as the best part: Athens.
Later on, Lycus was driven from the territory by Aegeus himself, and had to seek refuge in Arene, Messenia. Pallas and his fifty sons revolted at a later time, being crushed by Aegeus' son Theseus.
Still without a male heir with his previous marriages, Aegeus asked the oracle at Delphi for advice. According to Pausanias, Aegeus ascribed this misfortune to the anger of Aphrodite and in order to conciliate her introduced her worship as Aphrodite Urania (Heavenly) in Athens.
The cryptic words of the oracle were "Do not loosen the bulging mouth of the wineskin until you have reached the height of Athens, lest you die of grief." Aegeus did not understand the prophecy and was disappointed. This puzzling oracle forced Aegeus to visit Pittheus, king of Troezen, who was famous for his wisdom and skill at expounding oracles. Pittheus understood the prophecy and introduced Aegeus to his daughter, Aethra, when Aegeus was drunk. They lay with each other, and then in some versions, Aethra waded to the island of Sphairia (a.k.a. Calauria) and bedded Poseidon. When Aethra became pregnant, Aegeus decided to return to Athens. Before leaving, he buried his sandal, shield, and sword under a huge rock and told her that, when their son grew up, he should move the rock and bring the weapons to his father, who would acknowledge him. Upon his return to Athens, Aegeus married Medea, who had fled from Corinth and the wrath of Jason. Aegeus and Medea had one son named Medus.
When Theseus grew up, he found his father’s belongings left for him and went to Athens to claim his birthright. Aegeus recornized him as a son by his sword. Medea, Aegeus’ wife perceived Theseus to be a thread for her children’s inheritance and first tried to discredit and then to poison Theseus. When Aegeus discovered these schemes, he drove Medea out of Athens. 
While visiting in Athens, King Minos' son, Androgeus managed to defeat Aegeus in every contest during the Panathenaic Games. Out of envy, Aegeus sent him to conquer the Marathonian Bull, which killed him. Minos was angry and declared war on Athens. He offered the Athenians peace, however, under the condition that Athens would send seven young men and seven young women every nine years to Crete to be fed to the Minotaur, a vicious monster. This continued until Theseus killed the Minotaur with the help of Ariadne, Minos' daughter.
After his adventures in Crete, Theseus returned by ship to Athens. His father, Aegeus previously had asked him to hang a while sail as a sign that Theseus is alive, but Theseus neglected this request. When Aegeus saw Theseus’ ships without a white sail, he assumed the worst and threw himself in his grief into the sea, named after him the Aegean Sea.
In Troezen, Theseus grew up and became a brave young man. He managed to move the rock and took his father's weapons. His mother then told him the identity of his father and that he should take the weapons back to him at Athens and be acknowledged. Theseus decided to go to Athens and had the choice of going by sea, which was the safe way, or by land, following a dangerous path with thieves and bandits all the way. Young, brave and ambitious, Theseus decided to go to Athens by land.
When Theseus arrived, he did not reveal his true identity. He was welcomed by Aegeus, who was suspicious about the stranger who came to Athens. Medea tried to have Theseus killed by encouraging Aegeus to ask him to capture the Marathonian Bull, but Theseus succeeded. She tried to poison him, but at the last second, Aegeus recognized his son and knocked the poisoned cup out of Theseus' hand. Father and son were thus reunited, and Medea was sent away to Asia.
Theseus departed for Crete. Upon his departure, Aegeus told him to put up white sails when returning if he was successful in killing the Minotaur. However, when Theseus returned, he forgot these instructions. When Aegeus saw the black sails coming into Athens, mistaken in his belief that his son had been slain, he killed himself by jumping from a height : according to some, from the Acropolis or another unnamed rock; according to some Latin authors, into the sea which was therefore known as the Aegean Sea.
At Athens, the traveller Pausanias was informed in the second-century CE that the cult of Aphrodite Urania above the Kerameikos was so ancient that it had been established by Aegeus, whose sisters were barren, and he still childless himself.
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