I am afraid I do not have any pictures of it to show you, but I am currently working on a medieval pavilion with a single central pole.  When completed, this pavilion will stand 13 feet tall, and will be roughly 20 feet in diameter at the floor.

The pavilion is based on an article by David Juijt, which can be found here.

Many many hours of work, and more than two miles of thread have gone into this pavilion so far, and I hope to have it finished before baronial muster in late July of 2003.

UPDATE August 20, 2004:  Not only did I not finish the pavilion in time for Baronial muster last year, I still haven’t finished it!  At present, I an seriously considering a change in the design, with ropes being used as the main support for the roof, in lieu of wooden spokes.  The reason for this is quite simply a matter of convenience, since ropes, if integrated with the canvas, can be much more easily transported and stored than wooden spokes.

At present, I can technically say that I have a finished tent, since the roof of the pavilion is compete.  Except for the fact that the roof has no actual entrance, it can still be used a a simple conical tent with a centre pole, which is a design that was indeed used in medieval times.

One of these days, I will have pictures.