Udalman, Udaler, Udalborn, Udal n. Vars. of Odal, etc.; property held by udal, or allodial, right Obs. exc. in Shetland and the Orkney Islands, where udal designates a freehold, land held in fee simple without any charter and free of any feudal character.
... naturally inaccessible nature of the ground on which it stood made it so. It stood on the site, and was formed partly of such materials as time had left of an old castle of the earls or ancient Udal lords of Shetland, and had been very much increased in size, and ornamented, as well as rendered a more commodious habitation by the present owner, Sir Marcus Wardhill. The dwelling-house consisted but of two stories, and standing, as it did, elevated ... — Ronald Morton, or the Fire Ships - A Story of the Last Naval War • W.H.G. Kingston