Peerages for the Kingdom of Great Britain

By title: O

All peerages for Kingdom of Great Britain

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Title Letters patent Extinct Merged into crown
Onslow (Barony) Richard Onslow - Fri 19th Jun 1716 - -
of Orford (Earldom) Robert Walpole - Tue 6th Feb 1742 2 March 1797 -
of Oxford and Mortimer (Earldom) Robert Harley - Sat 23rd May 1711 19 January 1853 -