See also
| Partner: | William SINCLAIR (c. 1408-c. 1484) | |
| Partner: | (unknown) | |
| Children: | Catherine SINCLAIR ( - ) | |
| Elizabeth SINCLAIR ( -1508) | ||
| Name: | William SINCLAIR | |
| Sex: | Male | |
| Father: | - | |
| Mother: | - | |
| Birth | c. 1408 | Roslin, East Lothian |
| Occupation | 11th Baron of Roslin, 3rd Earl of Orkney | |
| Death | c. 1484 (age 75-76) | |
| Name: | Catherine SINCLAIR | |
| Sex: | Female | |
| Spouse: | Alexander of ALBANY ( - ) | |
| Name: | Elizabeth SINCLAIR | |
| Sex: | Female | |
| Spouse: | Andrew LESLIE ( - ) | |
| Death | 1508 | |
A son and four daughters.
11th Baron of Roslin. Became first Earl of Caithness in 1445.
This William, Earl of Orkney, and first Earl of Caithness in the Sinclair line, was a very able and distinguished man in his day and generation. He held many important offices in the State, and had considerable political influence; he was a great lover of the beautiful in architecture, and built the far-famed Chapel of Rosslyn; he enjoyed the confidence of Kings James the First and Second of Scotland, and was entrusted by them with several important missions connected with the State, while he encouraged those who were engaged in literature at a time when it was meagre alike in extent as it was in substance.
During the time in which the Earl lived, titles of honour were in great demand, and he had a long list of them. He was Earl of Orkney, Duke of Oldenburg, Earl of Caithness, and Strathearn, Lord St. Clair, Lord Nithsdale, Baron of Rosslyn, Baron of Pentland and Pentland Moor in free forestry, Baron of Cousland, Baron of Cardin St. Clare, Baron of Herbertshire, Baron of Hertford, Baron of Graham Shaws, Baron of Kirkton, Baron of Cavers, Baron of Newborough, Baron of Roxburgh, &c., Knight of the English Order of the Garter, and of the French Order of the Cockle, Lord Admiral of the Scottish Seas, Lord Warden of the Three Marches, Lord Chief-Justice, Great Chancellor, Chamberlain, and Lieutenant of Scotland.