Tzangion
The tzangion (Ancient Greek: τζαγγίον, pronounced [tsaŋˈgion]), plural tzangia (τζαγγία) was a type of boot or sandal, which in the Middle Ages became an important part of the Byzantine Emperors' regalia. In the 4th century, the tzange was a type of elegant shoe, but its use as an imperial vestment in Byzantium only began later, and was influenced by eastern, most likely, Persian, usage.