parallels among the Indo-Iranian peoples, such as the Iranian khvarenah, and the Scythian royal insignia (the hestiai of ) which fell from the sky. Hence, Thracian helmets of precious metals were associated to the concept of a glowing light around the head of the sacred ruler, similarly to how the khvarenah was believed to take the form of a golden helmet among Iranian peoples. Since Fire was considered a solar element by the Thracians, it was therefore religiously associated with the Sun. Sunrise was also identified with the lighting of fire, and therefore the sacred king was believed to be "born" with the sunrise. This solar association had parallels among other Indo-European culture: among Celtic peoples, there was a rule dictating that the king had to wake up before sunrise; and the contests of the pretenders to the throne of the Persian Achaemenid Empire were held at sunrise. The "fiery investiture," also called the "solar investiture," was another iteration of this solar-royal association, and Thracian kings were considered to be all-seeing as the Sun, and therefore gazing at the ruler-Sun was taboo and was believed to cause blindness. Thracian royal properties were also usually marked using fire, gold and light. The wide open eyes depicted on Thracian helmets represented the conceptualisation of the ruler as all-seeing like the Sun, but were also symbols of inner sight which was attainable only through secret knowledge acquired by shamanistic initiation into the mysteries given to men by Orpheus/. Divine ancestry Since the Thracian kings were assimilated to the divine Hero, who in Thracian mythology was the son of a deity, they therefore claimed divine ancestry: in the myth of the Hero , once he had defeated the Chaos-dragon, he entered in hierogamy with the goddess , through which the god and the goddess the divine granters of royal power to the kings. Therefore, not only was the granter of the royal power of the kings, but so was , who in this aspect was the first king, not unlike Iranian heroes such as the Scythian and Scythes, and the Zoroastrian Yima and Haošiiaŋha. Hence, the mythological origin of royal dynasties was based on the attribution of a divine origin to royal power, and was the basis on which members of the royal dynasty were named: the founder of the kingdom of the Odrysians, Teres I, was named after the nymph or goddess Tereine,