10th Lord of Rosslyn William Sinclair & Isabel Strathearn 
They had a son named 1st Earl of Orkney Henry.
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Personal Details
10th Lord of Rosslyn William Sinclair
10th Lord of Rosslyn William was born about 1328 in Rosslyn Castle, Roslin, Midlothian, Scotland. 10th Lord of Rosslyn William is no longer alive.
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Children
1st Earl of Orkney Henry Sinclair
1st Earl of Orkney Henry was born about 1352 in Rosslyn Castle, Roslin, Midlothian, Scotland.1 He died in 1404 in Killed by English defending Orkney Islands, Scotland.