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York's Grade I listed Multangular Tower incorporates the base of the second century* western angle tower of the Roman legionary fortress of Eboracum.
The tower, along with the 40 yard long, 17 foot high stone wall immediately to the southwest, are some of the best examples of surviving Roman masonry in Great Britain.
There was a matching corner tower at the opposite end of the river-facing fortress wall (located approximately 1,370 feet / 418 metres to the southeast, where Feasegate is today) and six slightly smaller interval towers in between the two corner towers. (The foundations of one of these can be seen beside the entrance to St Leonard's Priory Water Gate and Hospital.) These towers were all built-out into the ditch that ran around the original (first century) Roman fort, necessitating the creation of a new (wider) ditch further way from the wall. The continuous bonding course of red tiles originally ran the full length of this wall and wrapped around the two corner towers.
In plan-view, the tower takes the form of a regular fourteen-sided polygon, although four of the sides were deliberately omitted when the tower was constructed. Archaeological evidence suggests that the gap was probably filled by a three-sided rectangular structure with stone foundations three-feet thick.
It is not known whether the tower had a roof during the Roman period.
The upper portion of the tower (with the cruciform arrow slits) dates from the 13th century, when the tower was known as 'Elrondyng'. During this period, the tower was almost certainly roofed, this being evidenced by a projecting stone water spout above one of the arrow slits. (The water spout is directly above the stone interpretation panel that can be seen towards the bottom-left of Images 1 and 3.)
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The tower gained its current name (the Multangular Tower) in 1683, when Dr Martin Lister (a well-respected physician with a fascination for antiquities) recognised its Roman origins and subsequently published his observations in the 1 January 1683 edition of the Royal Society's journal 'Philosophical Transactions'.
Both the lower and upper portions of the tower's walls show clear signs of alterations and repairs at various times over the course of history (see Images 1 and 3).
The tower's interior was excavated in 1831. When this excavation began, the ground surface within the tower was roughly level with the ledge that runs below the arrow slit embrasures (see Image 2).
* Various dates have been suggested for the construction of the Roman tower and adjacent walls, ranging from the early second to the early fourth centuries. However, excavations and subsequent finds analysis carried-out by the York Archaeological Trust between 2001 and 2004 indicate that the earlier date is most likely to be correct.