From the website:
Italian restorers have brought to light unique, bright, multicolored marble decorations that even contemporary Romans never got to admire.
The marbles crafted in a technique known as opus sectile, were designed to decorate the floor and walls of an ancient Roman palace more than 1,600 years ago. However, the roof of the palace collapsed during construction and the mosaics remained buried for centuries.
It's getting more into early medieval.