They were in origin the gods of the land, sea, and sky, and they were created to explain the 'why' of the natural world.
The Titans? Like, Kronos (Zeus, Posiedon, and Hades dad)?
Cronus.
King Arthur or any of the Greek Myths including the Gods like Zeus and Posiedon.
Only such god as Allah
Most of them were very wise while gods like Ares and Hades were not the brightest.
Posiedon is a Greek god. Like all gods, he is immortal. Meaning, he'll live forever.
In Greek Mythology, Zeus didnt hate Hades. Hades didnt like Zeus or Poseidon because they stuck him in the Underworld.
No never, Hades isn't evil and is Zeus's oldest sibling with Zeus being the youngest. Hades also is the most reasonable of the gods and isn't stupid enough to let his anger get the best of him unless it's a lowly human soul and only if they do something really bad like try to rape his wife Persephone. Hades has fought with Zeus vs the Titans but that's about it.
Zeus doesn't dislike Hades, he just finds him morbid and dark.
If you are asking 'did Zeus allow Hades to marry Persephone', then yes, he did.
Hades was Zeus's brother, Hades was given the underworld, Zeus the Sky and Poseidon (the third brother) the sea. they did not get along but there was never a vendetta or anything like it, Hades was passive rather than evil.
Zeus is the Lord of Olympus and the King of all Gods. He is unfaithful unlike his older brother Hades, the God of the Underworld who stays faithful to his wife, Persephone. They both have a way in showing their anger. While Zeus controls the weather with his mood, Hades would sometimes kill mortals without a cause. But Hades, who is not even depicted in the The Iliad, does not like getting close to Wars with his brothers. In fact, he lets Zeus and Poseidon do the fighting.