The “I.33 Manuscript” also known as the “Walpurgis Fetchbuch” or the “Tower Fechtbuch” is a German sword and buckler manual from approximately the 1300s. It is unique not only for being one of the oldest western martial arts manuals in existance, it also features a women on the last two pages of the manuscript, her name is Walpurgis (Walpurga).

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Buy a copy of the I.33 Manual at Chivalry Bookshelf
Links:
A Paper on I33 - By William Blacwode
I.33 - By Dieter Bachmann (many pictures)
A Partial, Possible Interpretation of the I.33 Manuscript - By John Jordan
Anonymous Fechtbuch : Manuscript I.33 - By Arma