HADRIANOPOLIS, in Ancient Geography, the name of several cities founded by the Emperor Hadrian, by whose name they were called. The largest and most important of these was that in Thrace, at the confluence of the Hebrus and Tonzus, which seems to have occupied the site of the more ancient city of Usoudama. It stood in the midst of a country of remarkable fertility, and its commerce and manufactures soon raised it to great importance. Its arms were noted over the East. It was besieged by the Goths in 378, but it soon recovered the shock, and was for many centuries the largest city in the Eastern Empire after the capital. (For its modern history, see ADRIANOPIE.) There were three other minor towns of this name, one in Bithynia, another in Phrygia, and a third in Illyricum, half-way between Nicopolis and Apollonia. The name of the last was changed into Justinopolis by the Emperor Justinian, who fortified and repaired it.