Upon his mother's death in 1709, the 1st Duke of Southampton succeeded to her hereditary peerages (the dukedom of Cleveland, earldom of Southampton and barony of Nonsuch).[2][3] At his death in 1730, the titles passed to his son William. The 2nd Duke of Southampton died without issue, so the titles became extinct upon his death in 1774.
Charles FitzRoy 1662–1730 2nd Duke of Cleveland, Earl of Southampton, and Baron Nonsuch, 1st Duke of Southampton, Earl of Chichester, and Baron Newbury
William FitzRoy 1698–1774 3rd Duke of Cleveland, Earl of Southampton, and Baron Nonsuch, 2nd Duke of Southampton, Earl of Chichester, and Baron Newbury
Grace Fitzroy 1697–1763
Henry Vane c. 1705–1758 1st Earl of Darlington 3rd Baron Barnard
Morgan Vane 1706–1779
Dukedoms of Cleveland (1st creation) and Southampton, and Marquess of Cleveland extinct, 1774
Henry Vane 1726–1792 2nd Earl of Darlington 4th Baron Barnard
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