163 Romans withdraw south to Trimontium and Hadrian's Wall

Trimontium is the name of a Roman fort at Newstead, near Melrose, Scottish Borders, close under the three Eildon Hills (whence the name trium montium). It was an advance post of the Romans in the Roman province of Valentia. Trimontium was occupied by the Romans intermittently from 80 to 211. At the height of the Roman occupation of the fort, no more than 1500 soldiers and a smaller civilian population lived in the settlement. The fort was laid out as a standard Roman fort. It has three layers of defences, the first being the central fort itself with its earthen defences built during the 1st century. The second layer is a series of four ditches built during the last part of the 2nd century. There is an additional series of walls and trenches in the west annex.