Heilsspiegelaltar - Augustus and Sibyl of Tibur

Konrad Witz's Augustus and the Sibyl of Tibur, from the Heilsspiegelaltar painted around 1435, depicts the legend in which the Tiburtine Sibyl showed Emperor Augustus a vision of the Virgin and Child in the sky. This legend was widely used to legitimize the Christian claim that even pagan prophets foretold Christ's coming. This work belongs to the Early Renaissance, the transformative period in European art when painters first applied mathematical perspective, naturalistic figure modeling, and archaeological interest in antiquity to the inherited traditions of medieval devotional painting. The tension between Gothic grace and Renaissance structure gives art of this period a distinctive energy.

The scene renders the emperor and sibyl with Witz's characteristic physical weight and material precision, the heavenly vision appearing above the solidly earthbound figures in a composition that contrasts mundane reality with divine revelation.