Hyperion was one of the eight titans who married their sibling. He ended up marrying Theia. His children played a massive role (Not as big as the children of Cronos and Rhea though). He had a daughter named Selene (Original goddess of the moon), Helios (Original god of the sun) and Eos (Dawn).
Hyperion was one of the four titans who held down his side of the cosmos while Kronos was dealing with his father. Hyperion was most likely the pillar of the east since his daughter was Dawn.