I had restarted the game. Before I restarted, I had bought Alsvinder(Pegasus) from Reda. Upon restart, when I got to England, I still had the Pegasus mount but I can't seem to access it. The Stables let me choose the mount. When I summoned the horse, it said "Mount Unavailable". I could ride all the rest of my others mounts, but Alsvinder I can't ride. What's happened? Last game before I restarted, I was able to do this right after I got him. Before I was able to ride Alsvinder, and now I can not.