Analysis of information sources in references of the Wikipedia article "History of Shetland" in English language version.
What James III had acquired from Earl William in return for this compensation was the comital rights in Orkney and Shetland. He already held a wadset of the royal rights; and to ensure his complete control, he referred the matter to parliament. On 20 February 1472 the three estates approved the annexation of Orkney and Shetland to the crown...