Leucarum was a coastal auxiliary fort in the Roman province of Britannia. Its remains are located beneath the town of Loughor in the Welsh city of Swansea. The Romans built a rectangular or trapezoidal fort of some 2 hectares at the mouth of the River Loughor in the AD70s as a garrison for Roman auxiliary troops. From initial Archaeological discoveries in the mid-19th century, through to major excavations during the 1980s, the fort is now well-documented as one of a number of such forts along the South Wales coast.