Indra’s Palace on Mount Meru: A Study on the Design Philosophy of Wu Zetian’s Bright Hall

Wu Zetian’s 武則天 Bright Hall 明堂 was an unprecedented structure, serving as both a political hub and a ceremonial center of the state, symbolizing the image of Wu Zetian’s regime. While it inherited some traditional design concepts, the core structure—such as the central pillar—differed significantly from earlier Bright Halls, aligning more closely with the Sudharmā Hall 善法堂 of the deity Indra in Buddhism. Furthermore, both the Bright Hall and the Sudharmā Hall were used for court gatherings and decision making, bearing the nature of the palace of heavenly gods. The high degree of similarity suggests that the design of Wu Zetian’s Bright Hall was likely modeled after the Sudharmā Hall. This design highlighted Wu Zetian’s identity as both the Pure Light Heavenly Maiden 淨光天女 and the Cakravartin 轉輪聖王, thereby reinforcing the political legitimacy and sanctity of her rule. The Bright Hall, together with the Celestial Pillar 天樞 which represented Mount Meru 須彌山 and the Heavenly Hall 天堂 symbolizing Tuṣita Heaven 兜率天, form a representation of Mount Meru’s cosmic landscape.