Convened by Empress Irene and Patriarch Tarasios, the council reversed decades of imperial policy that had banned religious images as idolatrous. It affirmed that icons could be venerated, though not worshipped as divine, distinguishing veneration from worship in a doctrine that shaped Orthodox Christian practice for the following twelve centuries.
The controversy had convulsed Byzantium since Emperor Leo III banned icons in the 720s, sending soldiers to smash mosaics and burn paintings deemed idolatrous, provoking riots and executions on both sides. Monks who hid icons in caves and monasteries kept the practice alive underground for two generations.
Empress Irene, ruling as regent for her young son Constantine VI, saw restoring icons as a way to heal the empire and align with Rome, which had never accepted the ban. She convened over 300 bishops first in Constantinople, where iconoclast soldiers disrupted the gathering, then successfully at Nicaea, safely removed from the capital's tensions.
The council's finding—that icons deserved veneration as windows to the divine rather than objects of worship in themselves—became foundational Orthodox theology. Iconoclasm would flare again in the ninth century before being permanently settled in 843, but the Nicene formula endured, and today the intricate gold-backed icons of Orthodox churches trace their theological justification directly to this eighth-century council.
Key people: Empress Irene, Patriarch Tarasios