Isabella Sinclair

From page 157 of Book of MacKay: "Lord Reay, who died in 1680, was twice married. By his first wife, Isabella Sinclair, a Caithness lady, whom he married in 1636, he had two children : —
i. Robert, who died early in life without issue. ii. Jane, married (contract 14 November, 1665) Eobert Gordon, third son of John, Earl of Sutherland. Eobert Gordon died 1 at Langdale, Strathnaver, 1671, without issue; and his widow afterwards married, secondly, Hugh Mackay IV. of Strathy, by whom she had issue as given in our account of that family."

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Cracroft's Peerage states that John [Mackay], 2nd Lord Reay mar. (1) 1636 Lady Isabella Sinclair, 2nd dau. of George [Sinclair], 5th Earl of Caithness, by his wife Lady Jean Gordon, only dau. of George [Gordon], 5th Earl of Huntly