Marquess of Antrim is in Marquis and Marquess Ireland.
In 1645 Randall MacDonnell 1st Marquess Antrim [aged 35] was created 1st Marquess of Antrim 1C.
On 3rd February 1683 Randall MacDonnell 1st Marquess Antrim [aged 73] died. Marquess of Antrim 1C extinct. His succeeded brother Alexander [aged 68] succeeded 3rd Earl Antrim 1C. Helena Burke Countess Antrim by marriage Countess Antrim 1C.
On 18th August 1789 Randal William MacDonnell 1st Marquess of Antrim [aged 39] was created 1st Marquess of Antrim 2C.
On 29th July 1791 Randal William MacDonnell 1st Marquess of Antrim [aged 41] died. Marquess of Antrim 2C extinct. His succeeded daughter Anne [aged 13] succeeded 2nd Countess Antrim 2C, 2nd Viscountess Dunluce.