Minos was competing with his brothers to rule Crete. Minos prayed to Poseidon to send a white bull as a sign of support for him to be king. Minos was to kill the bull as a sacrifice to Poseidon, but kept the bull because of its beauty. He thought Poseidon would not care, and Minos sacrificed his own bull. This angered Poseidon or Minos was disobedient and made Poseidon think he was not worthy. Poseidon cursed Minos' wife.
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It was born by his wife, who had an affair with a bull sent by Poseidon.
King Minos wanted to prove that he deserved to be king so he asked Poseidon to send a bull for him to sacrifice. However, Minos did not want to sacrifice the bull because of its beauty. As punishment, Poseidon had Aphrodite, goddess of love, make Minos' wife fall in love with the bull. The result was the half-man half-bull creature, the Minotaur.
Poseidon, god of the sea, had gives Minos, king of Crete, a bull to be sacrificed to him. Minos liked it so the bull never got sacrificed. Poseidon got mad and caused romance between the bull and Minos' wife. The result of this relationship was the Minotaur, half man, half bull.
The Minotaurs proper name was Asterion, "the starry one,"gifted to him by Pasiphae "All Shining", the immortal daughter of sun-god Helios. She was at the time married to King Minos of Crete; the Cretan bull was sent froth from the sea by Poseidon to be sacrificed, but when Minos did not, Poseidon was angered and caused Pasiphae to be cursed with the desire to couple with it while hidden inside a wooden cow crafted by the artificer Daidalos.
If you mean the Minotaur, the son of the wife of Minos by a bull, it was killed by the hero Theseus.