Hyperion was a Titan god of light or sunlight and was associated with watching and observation from above. He was also known as a Pillar of east. Together with his other three brothers, Crius, Coeus and Iapetus, they presided as the Pillars of holding Heaven and Earth apart. He was one of six sons of Uranus and Gaea and is mentioned by Apollodorus as one of the five brothers, all but Oceanus, who participated in rebellion against Uranus and later attacked him. When they overcame him, the four brothers probably held him down while Cronus castrated him. While most of the authors are identifying Hyperion as a unique character, Homer is equating Helios and Hyperion as one and the same character and it can be seen in both of his epics, the Iliad and the Odyssey.
Establishing a rhythm of days and months
Due to his diligent observation, he was first to understand the movements of the sun and the moon, as well as the other stars and seasons. He was believed to have ordered the cycles of the sun, the moon and the dawn. During his time, he married her sister Theia with whom he had three children who presided over these cycles. Helios presided over sun, Selene over the moon and Eos presided over the dawn.
If you want to learn a bit more about Selene, check the page of Theia or Sky deities.
Although there are notes of Hyperion participating in Titanomachy, there is no reference of his role in the war. It is only known that he sided with his brothers and fellow Titans against younger Olympians. And that he was in the end, after losing the war, imprisoned in Tartarus with his brothers and relatives. However, according to Aeschylus' lost play , he was later released by Zeus from Tartarus with the rest of the titans.