Hill had already been created Earl of Hillsborough and Viscount Kilwarlin of County Down in the Peerage of Ireland in 1751 with remainder, in default of male issue of his own, to his uncle Arthur Hill, 1st Viscount Dungannon.

[5] In 1772 he was further ennobled with a second Earldom of Hillsborough and as Viscount Fairford in the County of Gloucester, both in the Peerage of Great Britain.

[7][1] In 2013, the 9th Marquess succeeded, under the terms of a special remainder of 1802, to the title Baron Sandys.

This occurred in April 2013 with the death of Richard Hill, 7th Baron Sandys without male heirs.

The present family seat is Clifton Castle, near Masham, North Yorkshire.