Ironclad is a 2011 adventure film directed by Jonathan English. Written by English and Erick Kastel, based on a screenplay by Stephen McDool, the cast includes Paul Giamatti, James Purefoy, Brian Cox, Vladimir Kulich, Mackenzie Crook, Jason Flemying, Derek Jacobi and Kate Mara. The film chronicles the siege of Rochester Castle by King John in 1215. The film was shot entirely in Wales in 2009, produced on a budget of $US25 million.