The two titles refer to different places: the Aran Islands in Ireland, and the Isle of Arran in Scotland.

The final creation in the Peerage of Ireland came in 1762, when Sir Arthur Gore, 3rd Baronet, was created Earl of Arran, of the Aran Islands in the County of Galway.

He had previously represented Donegal Borough in the Irish House of Commons and had already been created Viscount Sudley, of Castle Gore in the County of Mayo, in 1758, and Baron Saunders, of Deeps in the County of Wexford, in 1758, in the Peerage of Ireland.

He sat as a member of the Irish Parliament for Donegal Borough and was one of the original sixteen Knights of the Order of St Patrick.

Lord Arran had sixteen children, and one of his daughters was Cecilia Underwood, Duchess of Inverness, second wife of the Duke of Sussex, son of King George III.

In 1884 he was created Baron Sudley, of Castle Gore in the County of Mayo, in the Peerage of the United Kingdom.

His son, the sixth Earl, was a soldier and also served as Lord Lieutenant of County Donegal.

In 1967, the eighth earl was a sponsor of the private member's bill which decriminalised homosexuality in England and Wales.

The latter's third son William Gore was the ancestor of the Barons Harlech (the present holder of this title is also in remainder to the baronetcy of Newtown).

The heir presumptive to the earldom is the present holder's third cousin once removed William Henry Gore (b.