Viscount Grandison is in Viscount Ireland.
On 10th April 1746 Elizabeth Fitzgerald Villiers 1st Countess Grandison was created 1st Viscountess Grandison of Dromana Country Waterford. Alan Mason Viscount Grandison by marriage Viscount Grandison of Dromana Country Waterford.
On 29th May 1782 Elizabeth Fitzgerald Villiers 1st Countess Grandison died. Her son George [aged 30] succeeded 2nd Earl Grandison of County Leitrim, 2nd Viscount Grandison of Dromana Country Waterford.
On 14th July 1800 George Mason aka Villiers 2nd Earl Grandison [aged 49] died. Earl Grandison of County Leitrim, Viscount Grandison of Dromana Country Waterford extinct.