Hyperion was one of the Titans, son of Uranus and Gaia. He represented light, wisdom and watchfulness
He was considered one of the four pillars that hold the heavens and the earth apart, and since his daughter was dawn, he was probably the pillar of the east. The other three pillars were his brothers Coeus (pillar of the north), Crius (pillar of the south), and Iapetus (pillar of the west). These four Titans were the ones that held their father Uranus in place, while Cronus castrated him with a sickle.
Source: https://www.greekmythology.com/Titans/Hyperion/hyperion.html
Source: https://www.greekmythology.com/Titans/Hyperion/hyperion.html
Last time I checked the 2nd amendment it did not specify any particular weapons, so they certainly didn't have just muskets in mind, it just says 'bear arms'.