EXTREMELY SENSITIVE CONTENT – 18+ ONLY
This post describes the medieval prison and oubliette of Conwy Castle, Wales. Shared solely for historical education and remembrance of those who suffered in medieval captivity.
Inside The Most HORRIFIC Medieval Dungeon In History – The Oubliette of Conwy Castle
Built in just four years (1283–1287) by King Edward I of England as part of his “Iron Ring” of fortresses to crush Welsh resistance, Conwy Castle in North Wales is one of the finest surviving examples of medieval military architecture. Yet beneath its magnificent towers lies one of the most feared prison cells of the Middle Ages: the oubliette in the Prison Tower.
An oubliette (from the French oublier = “to forget”) is a bottle-shaped pit accessible only through a trapdoor in the ceiling. Once a prisoner was lowered into it — usually by rope — the door was closed and the victim was literally forgotten, left to starve or die of thirst in total darkness.
At Conwy, the oubliette is a narrow, cylindrical shaft cut directly into the bedrock beneath the Prison Tower. It is approximately 4 metres (13 ft) deep with no ledge, no light, and no sanitation. The only opening is a small hatch high above. Archaeological surveys have revealed scratch marks on the walls — desperate attempts by prisoners to climb out.
Historical records confirm the dungeon was used from the late 13th century onward:
Welsh rebels captured after the conquest of 1283 were among the first prisoners.During the Glyndŵr Rising (1400–1415), Owain Glyndŵr’s supporters were held here before execution or ransom.In the 16th century, King Henry VIII’s officials used the castle prison for political and religious prisoners during the Dissolution of the Monasteries.The last documented use was in 1689, when Irish Jacobite prisoners were briefly held after the Glorious Revolution.
Because of the “forgetting” nature of the oubliette, no complete list of victims exists. Bones discovered during 20th-century restorations are believed to belong to some of those thrown inside centuries earlier.
Today the oubliette is open to visitors (protected by a grille). Standing above the black pit and hearing only the echo of dripping water is still described by many as one of the most chilling experiences in any British castle.
We remember the nameless men and women who disappeared into Conwy’s oubliette not to glorify cruelty, but to honour the Welsh resistance against conquest; to recognise that even the most beautiful castles were built on fear and suffering; and to ensure that the phrase “dungeon where men are forgotten” remains only a grim chapter of history, never a living reality again.
Official & reputable sources
Cadw (Welsh Government Historic Environment Service) – Conwy Castle official guidebook & archaeological reports
Taylor, Arnold J. – Conwy Castle and Town Walls (Cadw, 2008)
Royal Commission on the Ancient and Historical Monuments of Wales – Inventory of Conwy Castle (1956)
Ashbee, Jeremy – “Prisoners, Captives and Hostages in Medieval Wales” (2015)
National Trust & UNESCO World Heritage documentation – Castles and Town Walls of King Edward in Gwynedd