A letter written by a Roman emperor helped lead a team of archaeologists to an ancient temple that "adds significant insights into the social changes" from pagan beliefs to Christianity in the Roman Empire, experts announced recently. 

The lead archaeologist on the expedition, Douglas Boin, Ph.D., announced the "monumental discovery" at the annual meeting of the Archaeological Institute of America, according to a news release from St. Louis University, where Boin is a professor of history.