Zeus’ father, the Titan Cronus, immediately swallowed his children after birth so that none could overthrow him as he had his own father. When Zeus was born, Rhea, Zeus’ mother, hid the child from Cronus and gave the Titan a rock in swaddling clothes, which he swallowed instead. In secret, Zeus grew up on the isle of Crete until he was old and strong enough to challenge his father. During their battle, Zeus slit open Cronus’ stomach, allowing his swallowed brothers and sisters to escape, slaying the Titan.
With his two brothers, Poseidon and Hades, the three Gods drew lots to decide command of creation. Poseidon became king of the sea, Hades the underworld, and Zeus the sky. Atop Olympus, Zeus now rules Gods and Men and while he holds high expectations for others, he does not keep those standards for himself.
Many myths render Hera as jealous of his amorous conquests and a consistent enemy of Zeus's mistresses and their children by him. For a time, a nymph named Echo had the job of distracting Hera from his affairs by talking incessantly, and when Hera discovered the deception, she cursed Echo to repeat the words of others.
Zeus is the most powerful figure in Greek mythology and he knows it. Although he possesses great power, he also has great luck, able to do whatever he wanted with no repercussion - he has never been punished for any of his crimes against other gods and humanity (especially women) and this attitude continues.
A 'Most successful Shinji Matou', this lousy and self entitled dirt bag is impossible to control and as expected his wish is to bring about a new Age of Gods for him to do whatever he wants, whenever he wants.