Royal Armouries Manuscript I.33, also known as the Tower Fechtbuch or the Walpurgis Manuscript, is the oldest-known manual of swordsmanship in the western canon. Dated to the early fourteenth century, it is a stunning work of late medieval art and the Armouries' most treasured manuscript, one so famous it has become known simply by its shelf number: I.33. This new edition includes a critical introduction, transcription and translation by Jeffrey L. Forgeng, the foremost authority on I.33.