In this case I just tried to post an overview that I had sitting on my computer...
Here is another short listing of the history of the Bujinkan :
http://www.ninjutsu.at/index.php?option=com_content&task=blogcategory&id=14&Itemid=15
And yet another
http://www.bujinkanlillisdojo.com/
Gyokko ryu is considered to be the oldest of the ryu-ha within the Bujinkan.
Once again the history of the Bujinkan is not my forte so to speak. (though I try a little)
Hi Brian---it occurred to me that all of the material you posted in that `overview' note, plus these references, would make a great sticky in the Ninjutsu forum. A lot of times, I've noticed, people have to reinvent one or another wheel on various fora because the same (often very good) questions keep popping up, and it would be nice to have some fixed, permanent, compact reference material that inquiring minds could consult before asking those questions yet again... it just would save wear and tear on people's keyboard (as well as their patience and their sanity) to have that stuff `out there' at the start. I think this material of yours definitely merits that treatment...