Lancaster Roman Fort, also known as Wery Wall, Galacum or Calunium, is the modern name given to ruined former Roman fort atop Castle Hill in Lancaster in North West England. The first castra was founded c. 80 AD within the Roman province of Britannia. The fort is thought to be the origin of the name Lancaster. It appears in the Domesday Book as Loncastre, where "Lon" refers to the River Lune, with the Old English cæster (borrowed from the Latin castrum) for "fort".