The Most Honourable Francis George Hugh Seymour, 5th Marquess of Hertford (February 11, 1812–January 25, 1884) was the son of Admiral Sir George Seymour and a great-grandson of Francis Seymour-Conway, 1st Marquess of Hertford. The prefix The Most Honourable is a title of quality attached to the names of marquesses in the United Kingdom. ... February 11 is the 42nd day of the year in the Gregorian Calendar. ... 1812 was a leap year starting on Wednesday (see link for calendar). ... January 25 is the 25th day of the year in the Gregorian Calendar. ... 1884 is a leap year starting on Tuesday (click on link to calendar). ... Francis-Seymour Conway, 1st Marquess of Hertford (July 5, 1718 – June 14, 1784) was born in Chelsea, England, and died in Surrey, England. ...

He married Lady Emily Murray, daughter of David Murray, 3rd Earl of Mansfield, on 9 May 1839. They had ten children: May 9 is the 129th day of the year in the Gregorian Calendar (130th in leap years). ... 1839 was a common year starting on Tuesday (see link for calendar). ...

• Frederica Georgina Seymour (c. 1841–1848), died young.
• Lady Horatia Elizabeth Seymour (1842–1922), married Sir Henry David Erskine and had issue.
• Hugh de Grey Seymour, 6th Marquess of Hertford (1843–1912)
• Lady Florence Catherine Seymour (1845–1921), married Rev. James Blunt.
• Lord Albert Charles Seymour (1847–1891), married Sarah Napier and had issue.
• Georgina Emily Lucy Seymour (1848–1944), married Henry Stirling-Home-Drummond, maternal grandson of Charles Douglas, 6th Marquess of Queensbury.
• Lord Ernest James Seymour (1850–1930), married Lady Georgiana Fortescue, daughter of Hugh Fortescue, 3rd Earl Fortescue and had issue.
• Lady Constance Adelaide Seymour (1852–1915), married Frederick Barne and had issue.
• Lady Mary Margaret Seymour (1855–1948), married Sir George Dashwood, 6th Baronet and had issue.
• Reverend Lord Victor Alexander Seymour (1859–1935), married Elizabeth Cator and had issue.

The Lord Chamberlain or Lord Chamberlain of the Household is one of the chief officers of the Royal Household in the United Kingdom, and is to be distinguished from the Lord Great Chamberlain, one of the great offices of state. ...

The Most Honourable Captain Richard Seymour-Conway, 4th Marquess of Hertford KG (February 22, 1800–August 25, 1870) was the son of Francis Seymour-Conway, 3rd Marquess of Hertford. ... The titles of Earl of Hertford and Marquess of Hertford have been created several times in the peerages of England and Great Britain. ...