Roman fort of Eboracum. The original defences, consisting of turf ramparts on a green wood foundation, were built by the Ninth Legion between 71 and 74 AD. Later those were replaced by a clay mound with a turf front on a new oak foundation, and eventually wooden battlements were added, which were then replaced by limestone walls and towers. These stone defences are some of the few Roman remains that are visible above ground in York. The Multangular Tower is the western corner tower of the Roman fortress, and consists of both Roman and medieval architecture. The tower has 10 sides, from which it derives its modern name "multangular", and is 19 feet (5.8 m) high. It was built in its late Roman form during the early 4th century, when it was constructed with three floors to house a catapult. Five Roman stone coffins are in the Multangular Tower, which were brought from graveyards in other areas of York. A 76-foot (23 m) section of 4th-century wall connects the Multangular Tower to a small interval tower. The side of the wall and towers facing into Museum Gardens is carefully faced in stone, as during the Roman period it was on display. The other side is rougher because it was originally covered by an earth bank. The wall and towers were still in use after the end of the Roman period in Britain, and were subsequently incorporated into the medieval city walls. As late as the English Civil War they were being used to defend the city, and there is a hole in the wall along from the Multangular Tower that was made by a cannonball during this period. The Roman parts of the wall and towers are constructed of regular rectangular limestone blocks with a band of red tile running through them. The later medieval additions can be identified by the use of much larger blocks of limestone that cut through the red tiles in places and by the cross shaped arrow slits on the Multangular Tower. To the north of the Multangular Tower there is a stretch of the medieval city wall with the remains of the original Roman wall running parallel to it on the city side. Built into this part of the wall is the stone Anglian Tower, which was once thought to have been built during the reign of Edwin of Northumbria, but now is generally