FLORENCE, ITALY—A mass grave dating to the sixth or seventh century A.D. has been unearthed at a building site in Florence. The 60 bodies, perhaps representing victims of an epidemic, had been laid out head-to-toe, which is often done to maximize space. “We will conduct DNA and carbon-14 tests to determine the cause and time of death, as well as information on diet, pathologies, and work-related stresses at the time,” Tuscany Archaeology Superintendent Andrea Pessina told ANSAmed.