Chivalry and Betrayal: The Hundred Years' War is a 2013 documentary television series written and presented by cultural historian Dr. Janina Ramirez looking at a time when the ruling classes of England and France were bound together by shared sets of values, codes of behaviour and language for three hundred years that ended with the Hundred Years' War when chivalry ended with the devastating warfare of cannon and betrayal between rulers when England lost her French possessions. It was originally broadcast by the BBC in February 2013.