According to folklore, piris people were the first inhabitants of ancient Greece, and their king was Inakos. Inakos has a beautiful daughter named IO. Zeus met Io by chance and fell in love with him. Hera, the mother of the gods, is the wife of Zeus. She has long been familiar with her husband's infidelity, and she closely monitors all his pleasure-seeking behaviors on earth. In order to avoid Hera, Zeus once turned IO into a cow.

Extended data:

Once, Io was herding sheep for his father in Lerner Ranch. Zeus fell in love with her at the first sight. The love in Zeus's heart grew stronger and stronger, so he disguised himself as a man and came to the world to seduce and tease Io with sweet words: "Oh, young girl, how happy people who can have you are!" But no mortal in the world is worthy of you. You are only fit to be the wife of the king of gods.

Tell you the truth, I'm Zeus, you don't have to be afraid! It's sultry at noon. Come with me and rest in the shade on the left. Why torture yourself in the hot noon sun? You go into the dark Woods, don't be afraid, I am willing to protect you. I am a god who sticks to the scepter of heaven and can send lightning directly to the ground. "The girl was so scared that she ran away quickly to escape his temptation. Throw the whole area into the darkness, and she will run away. Now, she is wrapped in a cloud. She slowed down for fear of hitting a rock or falling into the water. Therefore, it fell into the hands of Zeus.

Baidu Encyclopedia -IO (Greek Fairy Tale Characters)