It stuck me last night, as I was reading Ms I.33, that we have no idea how long something was in use. We have no idea how long the style contained in Mss I.33 was being taught before the surviving manuscripts were written or long after those sources we have, we have no idea how widespread that sword and Buckler style was.
I suspect that about the time the buckler came into wide spread use someone was working with the combination to find best use, which became codefied as the style that we call Mss I.33 and I suspect that Mss I.33 was the base line that influced the 16th Century Masters who wrote down their teachings on sword and buckler.
Any thoughts...?

