His mother was Mary Georgiana Emma, daughter of Lord Hugh Seymour. Portarlington was returned to Parliament for the Portarlington constituency in 1857, a seat he held until 1865 and again between 1868 and 1880. However, as this was an Irish peerage he was not allowed to take a seat in the House of Lords.
He was promoted from cornet to lieutenant in the Dorsetshire Yeomanry on 20 April 1858.
Lord Portarlington married the Honourable Harriett Lydia, daughter of Henry Montagu, 6th Baron Rokeby, in 1855. They had several children.
Lady Portarlington died in November 1894.
17th United Kingdom Parliament. 18th United Kingdom Parliament. 20th United Kingdom Parliament.
21st United Kingdom Parliament.