Milecastle 17 (Welton/Whittledean) was a milecastle of the Roman Hadrian's Wall. The milecastle is located near to the Whittle Dene reservoirs and is visible as a platform in the ground. Just 174m west of the milecastle is a distinct change in wall construction, indicating that it may have formed a boundary between different legions. The existence of the milecastle has been known since at least 1732 and excavations have produced numerous finds and evidence of post-Roman occupation. The associated turrets both lie beneath the B3618 Military Road. A stone found near the milecastle is the only known written record of the name of Gaius Julius Marcus, a Roman Governor of Britain whose name has been erased from other inscriptions possibly because he fell out of favour with Emperor Caracalla.

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201 m

Whittle Dene

Whittle Dene is 12 miles (19 km) west of Newcastle upon Tyne, England, straddling the B6318 Military Road, and is a complex of reservoirs and treatment works forming the last stage in the supply of drinking water to Newcastle upon Tyne and Gateshead.
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1.5 km

Milecastle 16

Milecastle 16 (Harlow Hill) was a milecastle of the Roman Hadrian's Wall. The milecastle is located at Harlow Hill, Northumberland, England. There are no visible surface remains of the milecastle or either of its associated turrets.
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Milecastle 18

Milecastle 18 (East Wallhouses) was a milecastle of the Roman Hadrian's Wall. It is located to the west of the settlement of East Wallhouses in Northumberland and is visible as a platform in the ground. The milecastle is of a unique construction, having a gateway associated with builders of the Legio II Augusta and a layout typical of the Legio VI Victrix or Legio XX Valeria Victrix. Historians have suggested that it may have been begun by men of one legion and finished by those of another. One of Milecastle 18's associated turrets shows evidence of being used as a workshop, possibly for the repair of shoes.
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Harlow Hill, Northumberland

Harlow Hill is a small village in the civil parish of Stamfordham, in Northumberland, England. Harlow Hill lies on the line of Hadrian's Wall, and is the site of Milecastle 16. The Military Road also passes by the village. Harlow Hill was historically a township in the ancient parish of Ovingham. It became a separate civil parish in 1866. The civil parish was abolished on 1 April 1955, when it was merged with other parishes to create the civil parish of Stamfordham. In 1951 the parish had a population of 61.