Tōdai-ji (Eastern Great Temple) is a Buddhist temple complex that was once one of the powerful Seven Great Temples, located in the city of Nara, Japan. Though it was originally founded in the year 738 CE, Todai-ji was not opened until the year 752 CE.
Its Great Buddha Hall (Daibutsuden) houses the world's largest bronze statue of the Buddha Vairocana, known in Japanese as Daibutsu.
Vairocana (also Mahāvairocana) is a celestial buddha who is often interpreted, in texts like the Avatamsaka Sutra, as the dharmakāya of the historical Gautama Buddha.
In East Asian Buddhism (Chinese, Korean and Japanese Buddhism), Vairocana is also seen as the embodiment of the Buddhist concept of Śūnyatā. In the conception of the Five Tathagatas of Mahayana and Vajrayana Buddhism, Vairocana is at the centre and is considered a Primordial Buddha.
Vairocana is not to be confused with Vairocana Mahabali, son of Virochana.
According to en.wikipedia