Poseidon

Poseidon, also known as Earthshaker, Stormbringer, and the Father of Horses, is the god of the sea, earthquakes, and the creator of horses. He and Athena are rivals after Athena won a city (Athens) that he wanted. He is also, along with his brothers Zeus and Hades, one of The Big Three, one of whose children is the Prophecy Child, who will decide the fate of Olympus. That is why the brothers took an oath after WWII to never have half-blood children again, which he and Zeus broke, even though Nico and Bianca di Angelo are children of Hades.

History
Poseidon spent his childhood in his father's belly, along with the rest of his brothers and sisters. When Metis and Zeus tricked Kronos into vomiting them up, Poseidon joined their cause and battle against the Titans, along with his siblings Hades, Demeter, Hestia, and Hera.

After they won the war against the Titans, the three brothers; Zeus, Poseidon, and Hades drew lots. Zeus and Poseidon, had drew the sea and sky. Hades got the Underworld as this was the only realm left after his brothers.

Poseidon built a palace in the sea, and replaced Oceanus the old sea god, and married one of his daughters, Amphitrite. She became Queen of the sea, and they ruled together. They had a son, and named him Triton.

Poseidon is the father of many heroes, and sired Theseus.

Rivalry with Athena
For many eons, Athena and Poseidon have had rivalry between them. It all started when they competed for being the patron of the city Athens. The leader of the city told the two gods to make a gift for the newly constructed city. Poseidon made a useless salt-water spring, while Athena gifted them the Olive Tree. Seeing that the Olive Tree was much better than a salt-water spring, the leader of the newly constructed city named it after Athena (hence the name Athens) and made Athena a temple known as the Parthenon, and also made her the Patron of the city.

Some time later, Athena caught Poseidon with his girlfriend Medusa (who was once a pretty maiden) in her temple. Furious at Poseidon and Medusa for doing such disgusting acts in her temple, she turned Medusa and her sisters (because they helped Medusa get into the temple) into the "Three Gorgons". The competition for Athens and the terrible acts Poseidon committed in Athena's temple are probably the basis for why Athena dislikes Percy.

The series
Poseidon dated Sally Jackson, a beautiful mortal woman that he called 'queen among women' and that he hadn't found a woman like her in a thousand years. They vacationed together at Montauk, and conceived Percy. After a while, Poseidon left, telling Sally to send their baby to Camp Half-Blood when he was old enough.

Poseidon later visited Percy when he was a baby, and Percy always remembered the warmth of his father's smile, unaware his mother thought that they had never met.

When Percy made it to Camp Half-Blood, he didn't know who his father was. Poseidon knew that Percy was his son, but had yet to tell him.

The Lightning Thief
After Percy survived the hellhound's attack, Poseidon claimed him. This caused discord among the gods of Olympus, as this was proof that Poseidon had not honored the pact he had made with his two brothers. After Zeus' lightning bolt was discovered to be missing, Zeus suspects Poseidon used Percy to steal it, and demands he return it by the Summer Solstice, and Poseidon in turn wants an apology for being suspected on that date.

A quest is given to Poseidon's son Percy to find the missing lightning bolt and return it in time in order to stop a war amonst the gods. He succeeded, and Poseidon got to meet his son formerly. Poseidon was very sorry for Percy, because being a hero means a tragic end for most heroes. Percy told his father he wasn't sorry for being who he was, and Poseidon told him that he was a true son of the Sea god.

The Sea of Monsters
In The Sea of Monsters, Poseidon does not appear, but he is said to have sent his Cyclops son Tyson to the same school as Percy, in order to get them to know each other, and sent the Hippocampi to Percy and his friends,

The Titan's Curse
In The Titan's Curse, Poseidon joins the party on Olympus, talks to Percy about Luke, and about his prophecy. Percy assures his father he isn't afraid. Poseidon vouches for Percy and Bessie in the end, saving Bessie's life.

The Battle of the Labyrinth
In The Battle of the Labyrinth, Poseidon visits Percy, Sally, and Tyson at their apartment. Sally was embarrassed at seeing her old boyfriend again. Percy and Tyson greet him, and Poseidon is introduced to Sally's boyfriend, Paul Blofis. Poseidon then tells Percy of the war he is having in his underwater kingdom, and gives him a birthday present, a sand-dollar. He then warns Percy of the upcoming disasters, and leaves.

The Last Olympian
In The Last Olympian, when Percy sees Poseidon, he looks aged and weak, unlike the man he once knew. Poseidon was busy fighting the Titan of the sea, Oceanus, who was constantly attacking his kingdom. Poseidon had been fighting so hard, his strength had been deteriorated. However, Percy was able to convince Poseidon to come up from his kingdom and help bring down Typhon, which greatly aided the gods in their fight to save Olympus. He was very proud of Percy and Tyson, for fighting so strong, after the battle was over.

Family
He is the father of the Demigod, Percy Jackson by Sally Jackson, and Tyson the Cyclops. He is also a full brother to Zeus, Hades, Hera, Demeter, Hestia, and a son of Kronos.

His mother is Rhea and he (like his other siblings) has a half-brother, Chiron, the Centaur who helps run Camp Half-Blood.

He is married to Amphitrite, who seems to hate Percy at a first glance, due to all his affairs with mortals. Triton is his immortal son and next heir to be the Sea God.

He loves his sons Percy and Tyson, he also seems not to have a problem with Percy's relationship with Annabeth, and is glad Percy has found someone to love.

It is hinted in the end of The Last Olympian that he has more unclaimed children, though it's unclear whether or not he's kidding, as he both winks as though he's joking, and then reminds Percy to "know which ones can land", obviously talking about the future demigods that will appear, though whether or not he's talking about his own children. Poseidon also has an immortal family in his underwater palace.

Personality
Poseidon shares many characteristics with his brother Zeus being stubborn, proud, and temperamental. However he appears to have matured over the centuries to a point where these attributes do not dominate him to the same extent they do Zeus, making him much more reasonable. He is a very kind god to those who hold his favor, particularly his children and those who help his children. He has a quick temper, like Percy, but is a honest man and cares deeply for Percy, calling him his 'favorite son". It is also said he even cares for the cyclopes at a nearly equal level' to Percy, despite their monstrous forms. He appears to watch over all of his children, and always sends Percy help when he can- at first Poseidon didn't know what to think about Percy, but grew to love him deeply. (This is different to the film, where he is shown loving him massively before Percy even knew of his existence, to the extent of threatening Zeus if he harmed him.) He is also shown to have a somewhat sharp, cynical sense of humour, saying Zeus "should have been the God Of Theatre" due to his fondness for dramatic exits.

Appearance
He has black hair, neatly trimmed beard, and sea-green eyes. He wears leather sandals, khaki Bermuda shorts, and a shirt with coconuts and parrots on it. He sometimes is seen wearing Birkenstocks. He used to wear a battered cap decorated with fishing lures. It said NEPTUNE'S LUCKY FISHING HAT. In The Last Olympian, his apperance was said to be gray hair and looking older than he usually did.

Powers
Poseidon is an extremely powerful god believed to be equal even to Zeus or even greater. As god of the sea he can control water on a level far greater then anyone else on the planet, using it to achieve anything he can conceive. He is capable of summoning and controlling fierce storms over the water, though it is unknown to what extent he can summon storms over land or how his weather powers compare to Zeus. He can project beams of blue light from his trident that can transform targets or even outright destroy what they hit, depending on his will. Like all Gods, his element is linked with his emotions- when he is angry, he inadvertantly summons hurricanes, when at peace, the sea is calm. The arc of blue light fired by poseidon is presumably his powers of transmografication and disintigration, along with other things. He presumable possesses the standard powers of a God - often using these powers to further assister Percy, even when its against the rules. It is see in the books that Percy has the ability to control ships on the water and all aspects of navigation and speed- Poseidon must also have a much more advanced version of these powers. He is also able to control his own appearance to a certain degree, though it is linked with his powers- when he is exhausted, his hair begins to go grey and he looks much older.

His power is enough that he is capable of seriously wounding even Typhon as shown in the climax of The Second Olympian War. It is unknown how this marks his power compared to Zeus. The wound was greater then anythng Typhon had yet recieved from other other Olympians, but Typhon himself would have been exahausted from weeks of fighting and was at the time bound in chains by cyclopese Posiedon brought with him limiting his movements, though it should also be considered that Poseidon himself was also exhausted becouse he had also fought his own war in the sea with Oceanus.

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Symbol of Power
Posideon's symbol of power is the trident. He can project beams of blue light from it that can transform targets or even outright destroy what they hit.

Children

 * Tyson
 * Percy
 * Triton
 * Antaeus
 * Polyphemus

Film
In the film The Lightning Thief, Poseidon is played by Kevin McKidd.