His mother was Lady Georgiana, daughter of George Howard, 6th Earl of Carlisle.
Between 1855 and 1858 and 1859 and 1864 Clifden served as Aide-de-Camp to the Lord-Lieutenant of Ireland, his uncle the Earl of Carlisle.
In 1895 he succeeded his nephew as fifth Viscount Clifden and fourth Baron Dover and entered the House of Lords.
The viscountcy of Clifden and barony of Mendip were passed on to his second cousin, Thomas Agar-Robartes, 2nd Baron Robartes.
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