Viscount Newcomen is in Viscount Ireland.
On 25th January 1803 Charlotte Gleadowe-Newcomen 1st Viscountess Newcomen was created 1st Viscountess Newcomen with the remainder to his male heirs of her husband.
On 16th May 1817 Charlotte Gleadowe-Newcomen 1st Viscountess Newcomen died. Thomas Gleadowe-Newcomen 2nd Viscount Newcomen [aged 40] succeeded 2nd Viscount Newcomen, 2nd Baron Newcomen.