Sir John Denis Browne, 1st Marquess of Sligo, KP, PC (Ire) was an Irish peer and politician, and was the son of Peter Browne, 2nd Earl of Altamont, and his wife Elizabeth, daughter of Denis Kelly, Chief Justice of Jamaica and owner of two sugar plantations. Browne was styled Viscount Westport from 1771 to 1780 and known as John Browne, 3rd Earl of Altamont from 1780 to 1800. Browne represented Jamestown in the Irish House of Commons from 1776 to 1780, when he succeeded as Earl of Altamont. He served as High Sheriff of Mayo for 1779. He was elevated to Marquess of Sligo on 29 December 1800 and was appointed a Knight of the Order of St Patrick on 5 August 1800.
Sir John Denis Browne, 1st Marquess of Sligo, KP, PC (Ire) was an Irish peer and politician, and was the son of Peter Browne, 2nd Earl of Altamont, and his wife Elizabeth, daughter of Denis Kelly, Chief Justice of Jamaica and owner of two sugar plantations. Browne was styled Viscount Westport from 1771 to 1780 and known as John Browne, 3rd Earl of Altamont from 1780 to 1800. Browne represented Jamestown in the Irish House of Commons from 1776 to 1780, when he succeeded as Earl of Altamont. He served as High Sheriff of Mayo for 1779. He was elevated to Marquess of Sligo on 29 December 1800 and was appointed a Knight of the Order of St Patrick on 5 August 1800.
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