Minotaur, in Greek mythology, monster with the head of a bull and the body of a man. It was the offspring of Pasiphaë, queen of Crete, and a snow-white bull the god Poseidon had sent to Pasiphaë's husband, King Minos. When Minos refused to sacrifice the beast, Poseidon made Pasiphaë fall in love with it. After she gave birth to the Minotaur, Minos ordered the architect and inventor Daedalus to build a labyrinth so intricate that escape from it without assistance would be impossible. Here the Minotaur was confined and fed with young human victims Minos forced Athens to send him as tribute. The Greek hero Theseus was determined to end the useless sacrifice and offered himself as one of the victims. When Theseus reached Crete (Kríti), Minos's daughter Ariadne fell in love with him. She helped him escape by giving him a ball of thread, which he fastened to the door of the maze and unwound as he made his way through it. When he came upon the sleeping Minotaur, he beat the monster to death and then led the other sacrificial youths and maidens to safety by following the thread back to the entrance.