5th Earl of Mount Alexander Thomas Montgomery

1667 - 1757  (90 years)

• Name	Thomas Montgomery
  Title	5th Earl of Mount Alexander
  Birth	1667
  Gender	Male
  Occupation	1726	Down, Northern Ireland   [1, 2, 3]
  	High Sheriff for County Down
  Title	7th Viscount of the Great Ardes
  Death	7 Apr 1757	Prince William, Virginia, USA   [1, 2, 3, 4, 5]
  Person ID	I59067	Clan Montgomery Society
  Last Modified	21 Aug 2026

  
  

  Father	Henry Montgomerie,   b. 1656, Mellifort Louth Ireland d. 22 Oct 1731, Newtonards, Down, Northern Ireland (Age 75 years)
  Relationship	natural
  Mother	Mary St Lawrence,   b. 1652, Howth, Scotland d. 25 Aug 1705 (Age 53 years)
  Relationship	natural
  Marriage	1672  [1, 5]
  Family ID	F19518	Group Sheet  |  Family Chart

  
  

  Family	Mary Angelica De la Cherois
  Family ID	F19515	Group Sheet  |  Family Chart
  Last Modified	21 Aug 2026

  
  

• Event Map	Load the map	Occupation - High Sheriff for County Down - 1726 - Down, Northern Ireland Death - 7 Apr 1757 - Prince William, Virginia, USA  = Link to Google Earth
  Pin Legend	: Address       : Location       : City/Town       : County/Shire       : State/Province       : Country       : Not Set

  
  

• Notes

  Titles extinct after Thomas died. Titles went to De La Cherois family Per BG Montgomery died without issue; leaving line ended; title/lands passed to Braidstone branch Per Price, he came to Virginia with Lord Fairfax and William Montgomery (see Anne Montgomery who married William Thomas Lewis

  
  

• Sources

  [S253] Montgomery, Thomas Harrison, Genealogical History of the Family of Montgomery (Name: Printed for Private Circulation; Location: Philadelphia; Date: 1868;), Electronic Book .PDF 170 pages a_genealogical_history_of_the_family_of_.pdf. [S321] Montgomery, Robert H, Montgomery Families: Irish Notes (Name: The New England Historical and Genealogical Register; Date: 1958;), Page 288 Montgomery_Irish_Notes.pdf. [S253] Montgomery, Thomas Harrison, Genealogical History of the Family of Montgomery (Name: Printed for Private Circulation; Location: Philadelphia; Date: 1868;), Pages 123-127 Montgomerys de Braidstane Electronic Book .PDF 170 pages a_genealogical_history_of_the_family_of_.pdf. [S107] Clan Montgomery Society International (Location: http://www.clanmontgomery.org/database/surnames.html;), http://www.clanmontgomery.org/homepage.html. [S270] Montgomery, Bo-Gabriel de, Origin and History of the Montgomerys (Name: William Blackwood and Sons, Ltd; Location: Edinburgh and London; Date: 1948;), This book is available electronically on ancestry.com.