Richard A. Allen and Dorothy Green, and grandson of John Allen, 1st Viscount Allen, he succeeded to the title of 5th Viscount Allen, County Kildare, and its subsidiary titles, on 10 November 1753, on the death of his brother, the 4th Viscount, who had died without issue.
He gained the rank of captain in 1758 in the service of the 37th Regiment, under Prince Ferdinand of Brunswick, and fought in the Battle of Minden in 1759.
Daughter of Gaynor Barry Esq.
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