Kashima-Shin-ryū is, for me, the school that shows what an honest martial history can look like. Almost every classical Japanese art carries a founding legend that runs back into the medieval past, and most of the time there is simply no way to test it; you either accept the tradition or you do not. This school is different, not because its story is more modest, but because somebody has done the work of separating what can be documented from what is handed down, and the tradition has been willing to let that happen.
A large part of the reason is one remarkable book. The American historian Karl Friday trained in Kashima-Shin-ryū, earned a teaching licence in it, and then wrote a full scholarly history of the school, treating it with the same critical tools he would bring to any other historical subject. I find that combination genuinely unusual and rather moving: a practitioner who refuses to let his own loyalty soften his judgement, and a tradition secure enough to be studied that way. Most koryū have never had anything of the kind written about them, and are known to outsiders only through their own accounts.
The deep history is exactly as uncertain as you would expect, and I think it is better for being admitted. The Kashima Shrine really was an ancient centre of swordsmanship, and Matsumoto Bizen-no-kami really did exist; but the chain that ties the medieval shrine to the present school grows thin the further back you follow it, and the most dramatic links cannot be proved. None of this diminishes the art. It only means that the school's genuine age, which is considerable, does not need the legendary parts propping it up.
I am fascinated, too, by the figure of Kunii Zen'ya. He was plainly an extraordinary swordsman, and he is also the kind of figure around whom stories collect, so that the man and the legend are now hard to pull apart. There is a tale, endlessly repeated, of him defeating challengers of every style in the chaos after the war, and whatever its basis, it has taken on a life of its own. I enjoy these stories, but I try to hold them at arm's length, because the temptation to turn a real master into a folk hero is exactly the kind of thing a reference should resist.
What I take from Kashima-Shin-ryū in the end is a model. Here is a tradition that is old, technically serious and proud of its lineage, and that has still allowed its history to be examined honestly, legend and record set side by side rather than blended together. That is precisely the spirit I would like this whole encyclopedia to have: respect for the traditions, affection even, but never at the cost of saying plainly what is known and what is only believed.