Royal Armouries Ms. I.33 is the earliest known surviving European fechtbuch (combat manual), and one of the oldest surviving martial arts manuals dealing with armed combat worldwide. I.33 is also known as the Walpurgis manuscript, after a figure named Walpurgis shown in the last sequence of the manuscript,[1] and "the Tower manuscript" because it was kept in the Tower of London during 1950-1996; also referred to as British Museum No. 14 E iii, No. 20, D. vi.
It was created around 1300 in Franconia and is first mentioned by Henricus a Gunterrodt in his De veriis principiis artis dimicatoriae of 1579.
The manuscript is anonymous[2] and is so titled through an association with the Royal Armouries Museum.[1]