WINDSOR CASTLE: THE PRISON CHAMBER.
Our view shows the interior of the prison chamber above the gateway through which the visitor passes before entering the great staircase that climbs the mound of the Round Tower, or Keep. Charles I. was imprisoned at Windsor from December 22nd, 1648, to January 19th-the day before his trial, and the portrait seen above is believed to be his. Among other royal captives who have been detained here are David II. of Scotland, John II. of France, and James I. of Scotland, who, while at Windsor, fell in love with his future queen, Jane Beaufort. It will be seen that some of the prisoners in this room amused themselves by cutting their names and arms on the wall. In especially bold lettering are the words, "Edmund Fortescue, prisoner in this chamber the 12th day of January, 1642,'' and the signature "Devon."
source: The Queen's London : a Pictorial and Descriptive Record of the Streets, Buildings, Parks and Scenery of the Great Metropolis, 1896