Viscount Goderich
Grey succeeded his father as 12th Earl of Kent in 1702, having succeeded his mother as 2nd Baron Lucas earlier the same year. He was created Marquess of Kent, Earl of Harold and Viscount Goderich in 1706, Duke of Kent in 1710 for relinquishing his Lord Chamberlain position, and made a Knight of the Garter in 1712. Left without a male heir after the death of his son George Grey, Earl of Harold, in 1733, he was created Marquess Grey in 1740, with a special remainder to his granddaughter Lady Jemima Campbell and her heirs male. She also succeeded to the Barony of Lucas. All his other titles became extinct at his death.