Earl of Sussex is a title that has been created several times in the Peerages of England, Great Britain, and the United Kingdom.
The fifth creation came in the Peerage of Great Britain in 1717 in favour of Talbot Yelverton, 2nd Viscount Longueville.
He married Susan Longueville, suo jure 13th Baroness Grey de Ruthyn.
Henry's son, Talbot, the aforementioned second Viscount, was created Earl of Sussex in 1717.
He was succeeded in the barony of Grey de Ruthyn by his grandson, Henry, the nineteenth Baron, the son of his daughter Lady Barbara Yelverton by Colonel Edward Thoroton Gould.