HM Prison Dartmoor

HM Prison Dartmoor stands on the high granite plateau of Dartmoor in Devon, its massive stone walls rising sharply above the surrounding moorland. The prison occupies a remote site near Princetown, a village built to serve the gaol, and is owned by the Duchy of Cornwall. The building was designed by Daniel Asher Alexander and completed in 1809 to house prisoners of war during the Napoleonic Wars. Its Grade II listed status recognises the prison’s historic importance.

The prison is notable for the thousands of French and American prisoners held here in the early 19th century. Among them were about 1,000 Black American sailors captured during the War of 1812, whose names appear in the General Entry Book examined by historian Nicholas Guyatt. Despite the isolation and harsh conditions, twenty-four American prisoners still managed to escape across the ten miles of wild moor. The prison later became a site of tragedy in 1815 when soldiers fired on prisoners during a disturbance, killing seven and wounding many more.

Visitors today see the high granite walls and the bleak expanse of Dartmoor stretching beyond. Inside, the prison’s history is visible in the surviving cell blocks and the memorial to the 271 prisoners of war buried on the site. The surrounding moorland offers stark, open views, while the prison itself remains a working Category C facility. Its past as a place of war, unrest and punishment is part of its enduring presence on the moor.