The ghost of Rochester castle, 1215-2013 (part I)

Tomorrow is siege day! A group of enthusiastic medievalists from King's College (with reinforcements from all around London and even Oxford University) are chasing down the early history of the 1215 barons' war all the way to Rochester. We plan to set camp outside the castle,  in expectation of a day-long siege. First stop, the cathedral, where God's ve…