… the largest Buddhist complex comprising Viharas and Stupas.

Udayagiri, site believed to have been active between the 7th - 12th Cen CE
Udayagiri, site believed to have been active between the 7th - 12th Cen CE © Janhwij Sharma

This Buddhist complex preceded by the Ratnagiri and Lalitgiri sites and is believed to have been active between the 7th - 12th Cen CE, per epigraphical records and artifacts found at the site, its historical name was "Madhavapura Mahavihara."