The historian Procopius wrote a Secret History of this empire.
The lawyer Tribonian revised the laws of this empire. This empire was divided into provinces named "themes." Rulers of this empire were protected by the Varangian Guard, which was composed of Vikings. The historian Procopius wrote a Secret History of this empire. Dynasties of this empire include the Isaurian and the Comneni. This empire employed the general Belisarius during the reign of Theodora and Justinian. The capital of this empire fell to Ottoman forces in 1453. For 10 points, name this empire with capital at Constantinople.
The lawyer Tribonian revised the laws of this empire. This empire was divided into provinces named "themes.
{Byzantine} Empire [or {Eastern Roman} Empire; or {Byzantium}]