Ravenna, Mausoleum of Theodoric the Great

Mausoleum of Theodoric the Great (454-526) the King of the Ostrogoths.

See:

1. Andre Grabar, L'Âge d'or de Justinien, de la mort de Théodose à l'Islam, Paris 1966
2. https://en.wikipedia.org/wiki/Mausoleum_of_Theoderic
3. Deborah Mauskopf Deliyannis, Ravenna in Late Antiquity: AD; 7. Ravenna capital: 600-850 AD, Cambridge University Press 2010, p. 124ff