John Denis Browne, 1st Marquis of Sligo

11th Jun 1756 - 1809


Son of John Browne, 2nd Earl of Altamont, and his wife Elizabeth nee Kelly, only child and heiress of Dennis Kelly of Jamaica. Educated at Eton, Sheriff of Co. Mayo, 1779, MP for Jamestown 1776-1780. Created Marquis of Sligo 31/12/1800.

  1. 'He created the lake to the West of Westport House and planted trees. He laid out the principal streets of the present town of Westport. He also established a theatre at the Octagon and built the town of Louisburgh.'


George E. Cokayne, The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom (London, 1910) Vol. 1 pp. 113-114.

  1. [accessed 14/07/2016]

Further Information

Louisa Catherine Howe
Howe Peter Browne, 2nd Marquess of Sligo (1788-1845)

Associated Estates (3)

The dates listed below have different categories as denoted by the letters in the brackets following each date. Here is a key to explain those letter codes:

  • SD - Association Start Date
  • SY - Association Start Year
  • EA - Earliest Known Association
  • ED - Association End Date
  • EY - Association End Year
  • LA - Latest Known Association
28/12/1780 [SD] - 1809 [LA] → Owner
28/12/1780 [SD] - 1809 [EY] → Owner
1792 [EA] - 1793 [LA] → Owner

Appears as [3rd] Earl] of Altamount

Legacies Summary

Physical (3)

Urban Development
description →
Reportedly responsible for laying out the principal streets of...
Country house
Westport House 
description →
The house had been built for the first Earl of Altamont in the 1730s, but was extended under the 2nd Earl in the late 1770s. John Denis Browne commissioned James Waytt to create a new dining room...
Urban Development
Louisburgh [Built] 
description →
18th century planned town in Co.Mayo, constructed in 1795 by John Denis Browne, then 3rd Earl of...

Relationships (4)

Son → Mother
Father → Son
Son → Father
Grandson → Grandfather

Addresses (1)

Westport, Co. Mayo, Ireland