It was made about 170-180 AD, and was found in the 19th century in Piraeus in Greece.
The relief, 86 x 87 x 16 centimetre, probably once was part of a sarcophagus.
It shows a fight between a Greek foot soldier and an Amazon horsewoman.
In Greek mythology, there was a war between the Greeks and the Amazon horsewomen nation. The war, the myths say, was because Greek demigod Heracles had stolen the precious girdle of Amazon Queen Hippolyta.