Milecastle 21

Construction

No details of the Milecastle's construction have been identified.

Excavations and investigations
  • 1966 - English Heritage Field Investigation. It was noted that there were no visible remains, and that the area was greatly disturbed by quarry tracks and spoil.[1]
  • 1989 - English Heritage Field Investigation. It was again noted that there were no visible remains, and the probable location was restated.[1]

Associated Turrets

Each milecastle on Hadrian's Wall had two associated turret structures. These turrets were positioned approximately one-third and two-thirds of a Roman mile to the west of the Milecastle, and would probably have been manned by part of the milecastle's garrison. The turrets associated with Milecastle 21 are known as Turret 21A and Turret 21B.

Turret 21A

Turret 21A (Red House) is probably located 73 metres (80 yd) to the east of the east wall of Onnum, though some doubt has been expressed by an English Heritage field investigation.[2] Its remains lie under the modern road.[3]

Location on Ordnance Survey 1:25 000 map: 55.010895°N 2.003081°W / 55.010895; -2.003081 (Turret 21A)

The site of Turret 21B

Turret 21B

Turret 21B (Fence Burn) is probably located partly beneath the military road, though the exact location has been speculated due to the presence of a small mound[3] along with dark soil and pottery discovered in 1930.[4][5]

Location on Ordnance Survey 1:25 000 map: 54.993672°N 1.736733°W / 54.993672; -1.736733 (Turret 21B)

Monument Records
MonumentMonument NumberEnglish Heritage Archive Number
Milecastle 2120473NZ 06 NW 10
Turret 21A18154NY 96 NE 1
Turret 21B18160NY 96 NE 3

References
  1. "Milecastle 21". Pastscape. English Heritage. Archived from the original on 10 March 2012. Retrieved 3 Aug 2010.
  2. "Turret 21A". Pastscape. English Heritage. Archived from the original on 10 March 2012. Retrieved 3 Aug 2010.
  3. Breeze, David J (1934), Handbook to the Roman Wall (14th Revised edition - Nov 2006), Society of Antiquaries of Newcastle upon Tyne, p. 183, ISBN 0-901082-65-1
  4. Birley, Eric B (1961), Research on Hadrian's Wall, Titus Wilson & Son, pp. 73, 171
  5. "Turret 21B". Pastscape. English Heritage. Archived from the original on 10 March 2012. Retrieved 3 Aug 2010.

Bibliography
  • Daniels, Charles (1979), "Review: Fact and Theory on Hadrian's Wall", Britannia, 10: 357–364, JSTOR 526069

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