Camelot Castle, the Knight quest home level, should have a stable containing a couple of peaceful saddled ponies or horses, which the player is free to tame, take, and use as steeds if their original one has died.

Excalibur starts out much weaker than it currently does, but you can perform further feats to enhance its power and give it more abilities as the game progresses. Such feats include: slaying a dragon, returning to King Arthur having finished the Knight quest, getting crowned as a lawful, re-dipping it into a fountain at a high experience level.