... the west side of the fortress, built in the thirteenth century and used as a prison; there are numerous inscriptions and devices on the walls made by the prisoners. Here Lady Jane Grey's husband carved in antique letters "Iane." In the Bell Tower, at the south-western angle, the princess Elizabeth was confined, and in the present century it was the prison of Sir Francis Burdett, committed for commenting in print on the proceedings of the House of Commons. The Tower Subway is ... — England, Picturesque and Descriptive - A Reminiscence of Foreign Travel • Joel Cook