SINCLAIR, William 4th of Roslin, Sir ^{1 2}

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William married Isabella of Strathearn, heiress of Caithness, daughter of Malise (V) 8th Earl of Strathearn, 19th Earl of Orkney and Caithness and Marjorie ROSS.^{1 2} (Isabella of Strathearn, heiress of Caithness was born about 1327.)

  Marriage Notes:

"She (Isabella of Strathearn) was married to Sir William Sinclair of Roslin, and her second son, Henry Sinclair, was made Earl of Orkney."

from Scots Peerage vol 2




"He (William Sinclair of Roslin) married Isabella, second daughter of Malise, Earl of Strathearn, Orkney, and Caithness, and had issue"

from Scots Peerage (vol 6) ^{1 2}