Tengri

Tengri, or Gok Tengri, "blue sky", is attested across the historical record of the Turkic and Mongolic steppe peoples as the supreme sky god and ultimate source of cosmic order, recorded as early as the Orkhon inscriptions of the eighth century, the oldest surviving Turkic-language texts, which credit Tengri directly with granting the Turkic khagans their right to rule.

Unlike many sky gods elsewhere who preside over a crowded pantheon of equally significant peers, Tengri in the classical steppe conception stands closer to a single supreme, largely abstract cosmic principle, the sky itself understood as living and aware, with other spirits and lesser deities, including Umay and Yer-Sug, the earth-water spirits, occupying subordinate roles beneath this overarching sky. The khagan's title, "Tengri qut", roughly "the charisma or fortune granted by Tengri", made Tengri's favour the direct theological basis of Mongol and Turkic imperial legitimacy, most visibly under Genghis Khan, whose thirteenth-century Mongol Empire justified its conquests explicitly as a mandate granted by Tengri to unite "all the peoples living in felt tents" under a single rule.

Tengri worship declined institutionally as the Turkic and Mongol khanates converted over subsequent centuries to Islam, Buddhism and Christianity, yet the underlying reverence for the sky and for ancestral steppe custom persisted at the folk level across Central Asia, Siberia and Mongolia, layered beneath these newer state religions rather than fully replaced by them, a pattern well documented in Mircea Eliade's comparative survey of shamanism, which treats Tengrist sky veneration as one of the oldest continuously attested threads in Inner Asian religious life.

Since the late twentieth century, following the collapse of Soviet religious suppression, a self-conscious Tengrism revival movement has grown across several Central Asian and Turkic nations, framing devotion to Tengri as a marker of pre-Islamic, pre-Soviet cultural and ethnic identity as much as a religious practice in its own right, with modern practitioners drawing on the same historical inscriptions and chronicle sources scholars use to reconstruct the classical belief. This dual life, an ancient state religion of the Mongol and Turkic empires and a living twenty-first century identity movement, makes Tengri one of the clearer examples in world religion of a sky god whose worship has never fully ended, only receded and periodically resurfaced.