Marquesses of Powis (1687)
- William Herbert, 1st Marquess of Powis (1626–1696)
- William Herbert, 2nd Marquess of Powis (1665–1745). Powis was the only son of William Herbert, 1st Marquess of Powis and Lady Elizabeth Somerset. He married Mary Preston in 1695. They had six children: William Herbert, 3rd Marquess of Powis; Lord Edward Herbert; Lady Mary Herbert; Lady Anne Herbert; Lady Charlotte Herbert; and Lady Theresa Herbert. His second son, Edward (died 1734) married Henrietta Waldegrave, daughter of James Waldegrave, 1st Earl Waldegrave in July 1734. They had one child: Lady Barbara Herbert (1735-1786)
- William Herbert, 3rd Marquess of Powis (1698–1748). Powis was the son of William Herbert, 2nd Marquess of Powis and Mary Preston. He died unmarried in 1748.
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