Viscount Dungannon is in Viscount Ireland.
On 17th February 1766 Arthur Hill aka Hill-Trevor 1st Viscount Dungannon [aged 72] was created 1st Viscount Dungannon, 1st Baron Hill of Olderfleet.
On 30th January 1771 Arthur Hill aka Hill-Trevor 1st Viscount Dungannon [aged 77] died. His grandson Arthur [aged 7] succeeded 2nd Viscount Dungannon.
On 13th July 1795 Arthur Hill-Trevor 2nd Viscount Dungannon [aged 31] and Charlotte Fitzroy Viscountess Dungannon [aged 28] were married at her father's house on Stanhope Street. She by marriage Viscountess Dungannon.
On 14th December 1837 Arthur Hill-Trevor 2nd Viscount Dungannon [aged 74] died. His son Arthur [aged 39] succeeded 3rd Viscount Dungannon.
On 11th August 1862 Arthur Hill-Trevor 3rd Viscount Dungannon [aged 63] died. Viscount Dungannon extinct. Arthur Edwin Hill aka Hill-Trevor 1st Baron Trevor [aged 42] inherited his estates including those at Brynkinalt, and changed his surname from Hill to Hill-Trevor.