Haemosu, the sun god who descended in a five-dragon chariot, is called 天帝之子 — son of the Heavenly Emperor — on the Gwanggaeto Stele and in the Samguk Sagi, placing him as divine offspring of Hwanin, supreme deity of heaven.
⚠ The Goguryeo sources name only 天帝 (Heavenly Emperor) as Haemosu's father; the identification with Hwanin comes from broader Korean mythological tradition rather than the Goguryeo texts themselves.
Hwanin, the Lord of Heaven, blessed his son Hwanung's desire to descend to earth and benefit humanity. He gave Hwanung the Three Heavenly Treasures and selected Mount Taebaek as the site for his civilizing mission.
Hwanin presides over Cheonsang, the celestial realm from which he surveyed the mortal world and judged it worthy of his son Hwanung's descent.
Hwanin dispatched the Samcheon, three thousand celestial attendants, to accompany Hwanung on his descent to Mount Taebaek, placing them under his son's authority to establish order in the human world.
Hindu Indra, Buddhist Indra (Sakka/Shakra), Persian Indra, and Korean Hwanin share origins in Proto-Indo-Iranian religion. The Samguk Yusa identifies Hwanin with Indra (帝釋天); in Buddhism Indra protects the Dharma; in Persian tradition he is demonized as a daeva.
⚠ Whether Hwanin is an indigenous Korean supreme deity identified with Indra through Buddhist terminology by the monk Iryeon, or a direct adoption of the Buddhist Śakra into Korean cosmogony, remains debated. The Samguk Yusa explicitly equates them: 桓因卽釋提桓因也.
When Hwanin permitted Hwanung to descend to the mortal world, three celestial ministers — Pungbaek the Wind Earl, Usa the Rain Master, and Unsa the Cloud Master — accompanied him from Cheonsang to govern weather and agriculture on Mount Taebaek.
Hwanin entrusted the Cheonbuin, three heavenly seals of divine authority, to his son Hwanung before dispatching him to Mount Taebaek to govern the human world.
Hwanin surveyed the mortal world below and chose Taebaeksan among three peaks as the place where his son could most broadly benefit humankind.
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