Archeologists have uncovered a rare, delicate Roman mosaic that dates all the way back to the mid-5th Century A.D. The discovery shocked researchers, who say that this mosaic was crafted during the “Dark Ages,” decades after Roman rule had ended in Britain. The discovery, found at Chedworth Roman Villa, in England, calls into question some historical theories about this time period. For example, it has long been theorized that Roman villas and buildings were abandoned after the empire broke down. Historians also suggested that the withdrawal of Roman troops occurred in Britain quickly. However, this mosaic reveals that this may not have been the case; perhaps the transition from Roman rule was far more gradual than that. “It has generally been believed that most of the population turned to subsistence farming to sustain themselves,” says Martin Papworth, an archeologist with the United Kingdom’s National Trust, in a statement. “What is …