Baron Treowen
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Baron Treowen was a title created in the Peerage of the United Kingdom on 20 June 1917 for the Member of Parliament for South Monmouthshire and Lord Lieutenant of Monmouthshire, Sir Ivor Herbert, 1st Baronet, of Llanarth. On his death on 18 October 1933 the barony and the baronetcy became extinct.