William Sinclair, 5th Lord Sinclair dating history

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William Sinclair (died 1570) was a Scottish nobleman and the 5th Lord Sinclair. In The Scots Peerage by James Balfour Paul he is designated as the 4th Lord Sinclair in descent starting from William Sinclair, 1st Earl of Caithness and 3rd Earl of Orkney, but historian Roland Saint-Clair designates him as the 5th Lord Sinclair in descent from the father of the 1st Earl of Caithness and 3rd Earl of Orkney, Henry II Sinclair, Earl of Orkney, who is the first person recorded as Lord Sinclair in public records. Roland Saint-Clair references this to an Act of the Scottish Parliament in which the 4th Lord Sinclair was made Lord Sinclair based on his descent from his great-grandfather, Henry II Sinclair, Earl of Orkney, the first Lord Sinclair. Bernard Burke, in his a Genealogical and Heraldic Dictionary of the Peerage and Baronetage of the British Empire, agrees with Roland Saint-Clair and says that William Sinclair was "in reality" the fifth Lord Sinclair.