Earl of Orkney
Although in 1379 Haakon VI Magnusson granted the earldom to Henry Sinclair, a Scotsman, the Earldom was still held to the Norwegian throne.
In 1468 however, the Orkney and Shetland islands were ceded, by Christian I of Denmark and Norway, against the unpaid dowry of his daughter Princess Margaret who was betrothed to the Scottish prince James III. Christian I never paid the dowry money owed to James' father and thus the two island groups became part of the Scottish kingdom. The incumbent Earl was William Sinclair.
James took the Earldom of Orkney for the Crown in 1470, and William was thereafter Earl of Caithness alone until he resigned the Earldom in favour of his son William in 1476, dying in 1484.
It was granted once again to George Hamilton.