The title of Viscount Harberton was created in the Peerage of Ireland in 1791. The Viscount bears the subsidiary title of Baron Harberton (1783), also in the Peerage of Ireland. The Peerage of Ireland is the term used for those peers created by British monarchs in their capacity as Lord or King of Ireland. ... 1791 was a common year starting on Saturday (see link for calendar). ... 1783 was a common year starting on Wednesday (see link for calendar). ...