Koios

Oceanus, Krios, Hyperion, Iapetus, Kronos, Arges, Brontes, Steropes, Cottus, Gyges, and Briares (brothers)
 Theia, Tethys, Themis, Mnemosyne, and Rhea (sisters)
 Phoebe (sister-wife)
 Leto and Asteria (daughters)
 Lelantos (son)
 Apollo (grandson)
 Artemis, Hecate and Aura (granddaughters)

### Appearances

*The House of Hades*
 *Percy Jackson's Greek Gods*

*"These Giants may* think *they will rule. Let them be our shock troops and destroy the Olympians - all well and good. But once the Earth Mother is awake, she will remember that* we *are her eldest children. Mark my words. The Titans will yet rule the cosmos."*
―Koios to Iapetus[src]**Koios** (also known as **Coeus**) is a son of Ouranos and Gaea. He is the Titan of Farsight, Intellect, and Knowledge, and is also the Titan Lord of the North. His Roman form is **Polus**.

After Kronos killed their father and claimed his supremacy as the Titan King of Mount Othrys, ushering in the "Golden Age", Koios was justly rewarded for his help with control over the North. Koios was one of Kronos' most loyal followers, held in great esteem by Kronos himself. Koios was also the only Elder Titan who was naturally clairvoyant, and could accurately predict the future. As a result, all of Koios' siblings, nephews and nieces would frequently approach him with questions about the future. In time, Koios married his beautiful sister Phoebe (the Titaness of Mystery), and fathered three children with her. However, since Koios lived far up north, and Phoebe lived near the Oracle of Delphi, they could not see each other very often.

Years later, Koios fought for his brother in the Titanomachy. During the final battle, Zeus used his Master Bolt to shear off the top of Mount Othrys, and hurl Kronos from his Black Throne, defeating the Titan King and cutting him up into a thousand pieces just with his scythe just as Kronos had done to his own father. Shortly thereafter, the gods invaded the ruins of Mount Othrys, and finally overwhelmed the remaining Titans, including Koios, and would be imprisoned in Tartarus with his brothers.

Centuries later, after Kronos turned Luke Castellan against the Olympians, the Titans were slowly resurrected to take on the gods. Koios was one of the Titans who aided Kronos in the Second Titan War, however the cause of his defeat is unknown, as neither Romans nor Greeks ever mention a fight with him.

The following year, after the Doors of Death were captured and opened by his mother Gaea, Koios was among the Titans and monsters who planned to return to the mortal world through the doors. Koios was reunited with his brother Iapetus, now known as Bob when he led Percy Jackson and Annabeth Chase through Tartarus. Koios reminded Iapetus about their uprising against Ouranos, remembering how their father kicked Iapetus in the face. Koios planned to return in order to complete the Titans' takeover of Mount Olympus, believing that Gaea would eventually remember that the Titans were her eldest children and forget about the Gigantes. He also hoped to persuade his daughter Leto to join them in their conquest, believing that she will agree to side with the Titans, after the way Zeus treated her after the birth of Apollo and Artemis. Koios's plans were thwarted when Iapetus ultimately betrayed the Titans and aided Percy and Annabeth against the Titans, monsters, and the lord of the pit, Tartarus. With the help of the peaceful Gigante Damasen, Percy and Annabeth returned from Tartarus and the Doors of Death were closed, imprisoning Koios inside Tartarus. It is unknown what happened to him after.