Isabella of Strathearn, heiress of Caithness ^{1 2}

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Isabella married William (III) Earl of Ross, son of Hugh Earl of Ross and Matilda or Maud DE BRUS, about 25 May 1342.¹ (William (III) Earl of Ross was born about 1311 and died in 1372.)

  Marriage Notes:

"William, fifth Earl of Ross, married (in terms of Papal dispensation dated 25 May 1342) Mary, daughter of Angus Og, Lord of the Isles. He had issue ..."

from Scots Peerage ¹

Isabella next married Sir William SINCLAIR 4th of Roslin, son of Sir William SINCLAIR 3rd of Roslin and Unknown.^{1 2} (Sir William SINCLAIR 4th of Roslin was born about 1320 and died after 17 September 1358 ².)

  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}