Who was Hyperion?

In Greek mythology, Hyperion was one of the Titans, son of Uranus (the sky) and Gaea (the earth). He became the father of Helios (the sun), Selene (the moon), and Eos (the dawn). Hyperion was the original sun god and is represented as gloriously bright and beautiful. In astronomy, the name Hyperion is given to one of the satellites of Saturn. Longfellow has given the name Hyperion to a romance which he published in 1839. It is an account of the travels of a young man through foreign countries, and is interspersed with legends, poems, and philosophical discourses.