Holders

• 1 Francis Seymour-Conway, 1st marquess of Hertford * 1718
• 2 Francis Ingram-Seymour-Conway, 2nd marquess of Hertford * 1743
• 3 Francis Charles Seymour-Conway, 3rd marquess of Hertford * 1777
• 4 Richard Seymour-Conway, 4th marquess of Hertford * 1800
• 5 Francis Hugh George Seymour, 5th marquess of Hertford * 1812
• 6 Hugh de Grey Seymour, 6th marquess of Hertford * 1843
• 7 George Francis Alexander Seymour, 7th marquess of Hertford * 1871
• 8 Hugh Edward Conway Seymour, 8th marquess of Hertford * 1930
• 9 Henry Jocelyn Seymour, 9th marquess of Hertford * 1958

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