Milecastle 16 was a small fortlet on Hadrian's Wall, positioned on the ridge at Harlow Hill in Northumberland, west of Newcastle. Like other milecastles, it was constructed in the 120s AD under Hadrian and likely garrisoned intermittently by detachments of auxiliary troops drawn from the nearby forts; it would have remained in use, with periods of refurbishment, into the later 4th century when the Wall system was abandoned. It served as a fortified gateway through the Wall, controlling north–south passage and housing perhaps 8–32 soldiers in internal barrack blocks.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Its location on the prominent Harlow Hill ridge gave it a commanding view across the Tyne valley and the Whittle Dene area, making it part of the Wall's regulated frontier permeability — managing movement, taxation of goods, and surveillance — rather than a purely defensive feature. It lies in the central-eastern stretch where the Wall was originally built in stone (the Broad Wall sector), positioning it among the earlier-completed milecastles.
Milecastle 16 has seen only limited investigation; its position has been confirmed by spacing measurements and antiquarian observation, but no major modern excavation has exposed its plan, and surface remains are largely ploughed out beneath modern fields and the line of the Military Road (B
Milecastle 16 was a small fortlet on Hadrian's Wall, positioned on the ridge at Harlow Hill in Northumberland, west of Newcastle. It is recorded in the Pleiades gazetteer of ancient places as a fortlet site from the Roman period in Britain.
Milecastle 16 (Harlow Hill) is classified as a Roman fortlet — a military site in the Pleiades ancient world gazetteer. Roman Britain's archaeology encompasses thousands of sites ranging from legionary fortresses and marching camps to villas, temples and towns.
Several Roman sites lie within a short distance, including Turret 15B (0.5 km), Turret 16A (0.5 km), Turret 16B (1 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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