I know where a very gentle daple stallion is, but he has not been used or worked on quite some time. He is about 6 years old and very gentle as far as stallions go. He did used to kick in the trailer but took to saddles pretty good, but now he just is stuck in his pen and the owners don't do anything, includiing excercise him anymore. I hate to see that and I don't know yet if they will sell him, but he is being neglected with no attention.

I used to train yearlings to ride, so I would think that you would just start training all over again. It should move quickly as you said the horse has been ridden before. Do you know if you can even put a saddle on the horse still? And if it accepts a saddle and blanket, can u do the cinches up?
Once we had a saddle on one of the yearlings, we would run them in the round pen for a bit, so they got used to moving in it. Then we would put our weight on the saddle by layin accross it, (don't climb on) and have someone lead them around. Eventually you will be able to sit on the saddle and have someone lead you around.
Do you have horses yourself? The bit would come next, but I haven't trained in a long time and don't want to make a mistake in trying to give you advice.
Good luck and if any of my info is incorrect I apologize. I would talk to the owners and ask if he was for sale, or even ask if you could ride him once and a while.

You will have to retrain her again. My mare was at least partially trained when I got her, and I wasn't allowed to ride her incase I got hurt, which is soo retarded. Now, you sit on her she'll buck you off. She's not a very friendly horse anymore, she needs to know her limits, which upsets me, I adored her father, Sir Jules Mac, he was such a sweetie. She is not. lol, but definitely, retrain, she may not take that much retraining either.