Katherine Isabella Hervey, Countess Jermyn

several sources give different marriage dates but all agree that they were married in the last months of 1830.

the possible marriage dates are;

9 October 1830

1 December 1830

9 December 1830

since Katherine died before her husband was made a Marquess , she held the title of Countess Jermyn which was the title her husband held before he was made a Marquess

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Links:

http://histfam.familysearch.org/getperson.php?personID=I52598&tree=...

http://thepeerage.com/p1493.htm#i14922

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Citations:

1. [S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 328. Hereinafter cited as The Complete Peerage.

2. [S6] Cokayne, and others, The Complete Peerage, volume II, page 329.

3. [S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 1, page 509. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.

4. [S2] Peter W. Hammond, editor, The Complete Peerage or a History of the House of Lords and All its Members From the Earliest Times, Volume XIV: Addenda & Corrigenda (Stroud, Gloucestershire, U.K.: Sutton Publishing, 1998), page 113. Hereinafter cited as The Complete Peerage, Volume XIV.