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The eldest son of Thomas Frederick Charles Vernon Wentworth of Wentworth Castle near Barnsley, Yorkshire and Dall House, Rannoch, Perthshire and his wife Lady Harriet Augusta Canning de Burgh, daughter of the Marquess of Clanricarde and grand daughter of former prime minister George Canning.
They included those of Lord Carlisle, Lord Dunkellin (in Galway) and Field Marshal Gough in the Phoenix Park.
In January 1826 he was appointed Joint Under-Secretary of State for Foreign Affairs (alongside Lord Howard de Walden) by the Earl of Liverpool, a post he held until August of the same year.
Beaumnont was born at Bywell Hall, Northumberland, the son of Wentworth Beaumont, 1st Baron Allendale, by his first wife Lady Margaret Anne de Burgh, daughter of Ulick de Burgh, 1st Marquess of Clanricarde, and his wife the Honourable Harriet Canning, daughter of George Canning.