1. William Douglas, Lord of Nithsdale has few details recorded about him.
William Douglas, Lord of Nithsdale had the following children:
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2. Egidia DOUGLAS, daughter of William Douglas, Lord of Nithsdale, married Henry Sinclair, 2nd Earl of ORKNEY.
Henry Sinclair, 2nd Earl of ORKNEY, son of Henry Sinclair. 1st Earl of Orkney ( -1404) and Jean Halyburton ( - ), was born circa 1375. He died in 1422. He and Egidia DOUGLAS had the following children:
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3. Lord William Sinclair, 3rd Earl of Orkney 3rd Earl Orkney, 1st Earl Caithness, son of Henry Sinclair, 2nd Earl of ORKNEY and Egidia DOUGLAS, was born before [Julian] February 1420. He had the title '3rd Earl Orkney, 1st Earl Caithness'. He had the title '3rd Earl Orkney, 1st Earl Caithness, 1st Lord Sinclair, Chancellor'. He died between 1476 and 1482. He died in 1480. He married Elizabeth DOUGLAS. He married Marjory SUTHERLAND.
Elizabeth DOUGLAS, daughter of Earl Archibald DOUGLAS (c. 1370-1424) and Lady Margaret STEWART Lady of Galloway (aft1367-bef1456), was born between 1385 and 1401. She died before 1451. She and William Sinclair, 3rd Earl of Orkney had the following children:
| 4 | William Sinclair, 2nd Lord Sinclair (bef1403-1487). William was born before 1403. He had the title '2nd Lord Sinclair'. He died on [Julian] 14 July 1487. |
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Marjory SUTHERLAND and William Sinclair, 3rd Earl of Orkney had the following children:
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