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

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Isabella married William (III) 5th Earl of Ross, son of Hugh 4th Earl of Ross and Matilda or Maud DE BRUS, on 28 May 1344.¹ (William (III) 5th Earl of Ross was born about 1311 and died in 1372.)

  Marriage Notes:

"Isabella, declared by her father to be the heiress of the earldom of Caithness in a grant of her marriage on 28 May 1344 to William, Earl of Ross, her uncle."

from Scots Peerage vol 2 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}