Koios

"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

Koios (Ancient Greek: Κοίος, also known as Coeus) is a son of Ouranos and Gaea. He is the father of Leto, mother of Apollo and Artemis, the twin archers. He is the Titan of farsight and the Lord of the North. Koios sided with his brother Kronos during the Second Titan War. It is unknown what his part in the second war was. During the Second Giant War, Koios planned on allowing the Giants to overthrow the Olympians, believing that eventually the Titans would rule again - with or without Kronos. His plans were thwarted when the Seven worked with his brother Iapetus and the Gigante Damasen to close the Doors of Death permanently. To the Romans, Koios was known as Polus.

History
Led by his brother Kronos, Koios worked with his brothers Iapetus, Hyperion, and Krios to restrain their father Ouranos, while Kronos slew him with his scythe. After the Titans took control of the world, Koios ruled as the Lord of the North and the Titan of farsight. He married his sister Phoebe, with whom he had his daughter Leto, the future mother of Apollo and Artemis.

In the First Titan War, the Olympians, the immortal children of Kronos and Rhea, fought against the Titans. To Koios's disappointment, his peaceful daughter Leto played no part in the war. Kronos was slain by his son Zeus with his own scythe. In the ensuing war, Koios was defeated and banished to Tartarus with the rest of his brethren.

Percy Jackson & the Olympians
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. Kronos and Hyperion led the Battle of Manhattan. Oceanus led the assault on Atlantis. Krios defended Mount Othrys. Iapetus attempted to overthrow Hades. It is unknown, however, what Koios's part in the war was. After Kronos was dissolved by Castellan, Koios, along with the other Titans, were sent back to Tartarus.

The House of Hades
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. Koios was reunited with his brother Iapetus, now known as Bob. During the Titan War, Iapetus's memory had been destroyed by Percy Jackson, when he tackled him into the River Lethe. In the Second Giant War, Iapetus defected to the side of the Olympians. Even as Tartarus healed his memory, Iapetus continued aiding Jackson and his girlfriend Annabeth Chase, who had been thrown into Tartarus in a fight in Rome.

Hidden by the Death Mist, Jackson and Chase were unseen by Koios. The Titan assumed Iapetus's memory was returning and that he was returning to their side. Iapetus didn't counter him. 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 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. He hurried off, assuring Iapetus that he would meet up with their brothers Hyperion and Krios at the entrance to the Doors of Death.

Koios's plans were thwarted when Iapetus betrayed the Titans and aided Jackson and Chase against the Titans, monsters, and the lord of the pit, Tartarus. With the help of the peaceful Gigante Damasen, Iapetus held the elevator's button, knowing that Jackson and Chase were needed in the war against Gaea. Due to Iapetus's and Damasen's sacrifice, Jackson and Chase returned from Tartarus and the Doors of Death were closed, imprisoning Koios inside Tartarus.

Appearance
Koios was roughly ten feet tall with elaborate Stygian iron armor and a single diamond blazing in the breastplate. His eyes were blue-white and as cold as a glacier. His hair was blue-white, cut in military style. He wore a helmet shaped like a bear and wielded a sword the size of a surfboard. According to Jackson, Koios had the same cold eyes as Artemis, with the same smile as Apollo.

Personality
Not much is known about Koios. He is probably fairly arrogant, since he believed that his race, the Titans, were superior children of Gaea. The Titan felt that the Titans were better than the Gigantes and the Olympians alike. He might be more friendly when around his fellow Titans, considering how he spoke to Iapetus when recounting their conquest against Ouranos.

Trivia

 * Koios was not well-known in Greek mythology, and even less in Roman mythology, where he was known as Polus. He was mainly mentioned on a list of Titans. He only considered prominent in the history of the Greco-Roman deities.