Frances Mackenzie, Countess of Seaforth Scottish countess (b. 1659) Parents Elizabeth Herbert, Marchioness of Powis William Herbert, 1st Marquess of Powis Children Alexander Mackenzie William Mackenzie, 5th Earl of Seaforth Lady Mary Mackenzie Siblings Lucy Herbert Winifred Maxwell, Countess of Nithsdale Lady Mary Herbert Lady Anne Herbert William Herbert, 2nd Marquess of Powis Lady Catherine Herbert Partners Kenneth Mackenzie, 4th Earl of Seaforth