Viscount Melbourne was a title created for Peniston Lamb in 1781 in the peerage of Ireland. He had already been made a baron in 1770 and in 1815 he was made an English peer. The second Earl served as Prime Minister of the United Kingdom, while his brother, the third Earl, was a dipolmat. The title became extinct on the death of the 3rd Viscount, Frederick Lamb.

Viscounts Melbourne (1781)

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