Minos, who was the king of Knosos ,was the son of Zeus and Europe.
One of Minos’s brothers, Sarpidon ,was the king of Gortys but he wanted to usurp the throne of Minos. Minos said that he was the chosen by the Gods to be king of Knosos , and to prove it, asked Poseidon (the god of the sea) to send him a bull to sacrifice. Poseidon did that, and everybody believed that Minos was right.
Minos however felt that the bull sent by Poseidon would improve his own stock, so he sacrificed another one and kept the one sent by the god.
Poseidon decided to punish Minos for this sacrilege by making his wife , Pasifae, fall in love with the bull. The offfspring of the union of Pasifae with the bull was, appropriately, a monster that ate human flesh, with a bull’s head and a human body, Minotaur.
Obviously, the Minotaur, was not someone that Minos liked to have running around in his palace, scaring (and sometimes eating ) his guests. So he locked him in a labyrinth constructed by Daedalus.
In order to deal with Minotaur’s weird tastes, Minos forced the Athenians, who have killed his son Androgeo, to send him fourteen young Athenians (seven male and seven female) every year to serve (as) dinner for the Minotaur.
Theseas, the son of the Athenian king, asked his father to let him be one of the fourteen to go to Crete. When they arrived , Minos daughter, Ariadne, saw Theseas and felt in love with him. So, when her father threw Theseas to the Labyrinth, she helped him kill the Minotaur, and escape.